In short: Materia Medica Pura (German Reine Arzneimittellehre) is Samuel Hahnemann's record of the symptoms medicines produced in healthy provers, issued in six German volumes between 1811 and 1821 and the first homeopathic materia medica. A chapter has no keynotes and no grades: it gives the preparation, a preface, the provers and cited authors, and numbered symptoms with the hour after the dose at which each appeared, running head to foot with the mind last. All 67 chapters of the Dudgeon and Hughes translation, served as 76 remedy pages, are free to read online on Similia, and this guide explains how to read one.
Most students meet Hahnemann second-hand, through the keynotes Boericke, Kent and H. C. Allen distilled from him, and the source can disorient at first: a Pulsatilla chapter of more than a thousand numbered lines, bracketed initials after some, a timing in hours after others. Once you know the schema it is the most transparent materia medica there is, because nothing in it has been interpreted for you.
The preparation and dose passages quoted below are historical text, reproduced to show how the chapters are built, not guidance for a patient.
What the Materia Medica Pura is, and what it is not
Place it against the books you already know: Boericke digests, Kent lectures, T. F. Allen compiles; Hahnemann records. The comparison of the 21 classic materia medica books files it under proving compilations, "no grading, no clinical symptoms, archaic wording", and Similia's hub page describes each chapter as "introductory observations, cited toxicological reports, and numbered proving symptoms".
That is also why it is worth reading: a chapter is the evidence rather than the summary, with Hahnemann's own provings, his pupils' and the older poisoning reports each marked as such. A materia medica is read by remedy, a repertory by symptom; if that distinction is new, the materia medica versus repertory explainer sets it out.
From the Fragmenta to six volumes: a short history
The Samuel Hahnemann bio gives the prehistory: the 1790 Cullen translation, the cinchona self-test and the 1796 essay on the principle of similars. In the Organon, in R. E. Dudgeon's translation, Hahnemann writes that "the first fruits of these labours" were recorded in the Fragmenta de viribus medicamentorum positivis, Leipzig, 1805, "the more mature fruits in the Reine Arzneimittellehre".
Dudgeon's translator's preface states that volumes I and II "had reached a third edition, while the remainder did not get beyond the second", and dates the volumes he used, as the table below shows. The first edition of volume I was printed by Arnold in Dresden and Leipzig in 1811 (source: archive.org, 20 September 2026), and an editorial footnote in the Dudgeon edition to the "Preamble" Hahnemann wrote for volume II records that its two case reports "originally appeared in 1816 in the first edition of the R.A.M.L."
The six volumes and which remedies are in each
Every chapter in the Dudgeon text opens with a line naming the German volume and edition it was translated from; collecting those lines gives the six volumes as Hahnemann left them. They are not alphabetical across the work; Dudgeon explains that each volume is "arranged alphabetically according to their common German names".
| Vol. | Edition Dudgeon used | Remedies (Dudgeon chapter titles) |
|---|---|---|
| I | 3rd ed., 1830 | Aconitum, Arnica, Belladonna, Cannabis sativa, Cina, Cocculus, Dulcamara, Mercurius (with the other mercurials), Moschus, Nux vomica, Oleander, Opium |
| II | 3rd ed., 1833 | Arsenicum, Bryonia, Ferrum, Ignatia, Magnes (with Magnetis polus arcticus and australis), Pulsatilla, Rheum, Rhus |
| III | 2nd ed., 1825 | Asarum, Chamomilla, China, Helleborus niger, Ipecacuanha, Scilla, Stramonium, Veratrum |
| IV | 2nd ed., 1825 | Argentum, Aurum, Camphora, Chelidonium, Conium, Digitalis, Guaiacum, Hepar sulphuris calcareum, Hyoscyamus, Ledum, Ruta, Sarsaparilla, Sulphur |
| V | 2nd ed., 1826 | Calcarea acetica, Cyclamen, Euphrasia, Menyanthes, Muriaticum acidum, Phosphoricum acidum, Sambucus, Spigelia, Staphisagria, Taraxacum, Thuja |
| VI | 2nd ed., 1827 | Ambra grisea, Angustura, Bismuthum, Capsicum, Carbo animalis, Carbo vegetabilis, Cicuta, Colocynthis, Drosera, Manganum aceticum, Spongia, Stannum, Verbascum |
The 67 printed chapters become 76 remedy pages on Similia because Argentum, Aurum and Mercurius are split at their printed sub-schemas: Argentum foliatum is served as Argentum metallicum, the gold-leaf schema as Aurum, and the mercurials as seven pages, from Mercurius solubilis to Cinnabaris plus the closing Various mercurials appendix.
Notice what is not here: Calcarea carbonica, Silicea, Sepia, Lycopodium, Graphites, Natrum muriaticum, Phosphorus and Kali carbonicum are absent, and the Calcarea that does appear is Calcarea acetica, not carbonica. The antipsorics belong to The Chronic Diseases, covered below.
The English editions, and the one you are reading on Similia
Similia's text is R. E. Dudgeon's translation, annotated by Richard Hughes and published by the Hahnemann Publishing Society in Liverpool: volume I (Aconitum to Ipecacuanha) in 1880 and volume II (Ledum to Verbascum) in 1881, 1,357 pages transcribed from the Wellcome Library scans (source: archive.org, 20 September 2026). Dudgeon put the medicines in one alphabetical sequence and every chapter on the plan of the third edition.
Dudgeon's preface records that "in 1846 Dr. Hempel published a translation" and is blunt about it: Hempel "omitted all names of authorities for the symptoms", left out "as many as eighteen" medicines, and produced a version "altogether very imperfect". Charles Julius Hempel's four volumes were published by William Radde in New York (source: archive.org, 20 September 2026); an old reprint that lacks the names of the cited authorities is probably his.
Hughes's role matters for reading. Hahnemann's quotations from older authors, he writes in the preface, "number in the whole Materia Medica Pura upwards of 4000", and he traced them to their originals, appending "such explanations and corrections as might be necessary" in numbered notes set below a line that separates them from Hahnemann's own asterisked notes. Watch them in the Pulsatilla chapter: "Literally, 'Tormina.'" is a translation choice, and "With relief of a chronic sacral pain, and therefore probably a curative effect" separates a clinical result from a proving symptom.
Anatomy of a chapter: Hahnemann's schema
The head of the chapter: preparation and edition
Every chapter begins with the pharmacy. Aconitum: "The freshly expressed juice of the plant at the time of the commencement of flowering mixed with equal parts of spirits of wine." Pulsatilla: two drops of the expressed juice into the first of thirty phials of alcohol, each "potentized by means of two strokes of the arm from above downwards". These are the preparation standards of the 1820s and 1830s, before the sixth Organon introduced the fifty-millesimal method (see the LM potencies guide). Then the edition line, "From vol. i, 3rd edit., 1830", tells you which German text you are reading.
The preface: Hahnemann's clinical essay
The prefaces are the nearest thing the book has to keynotes, and the later authors mined them. Aconitum's names "the so-called pure inflammatory fevers" and the states "seen in persons who have had a fright combined with vexation", and instructs that "particular attention should be paid to the symptoms of the disposition". Pulsatilla's is where the Pulsatilla type begins: most efficacious with "a timid, lachrymose disposition, with a tendency to inward grief and silent peevishness, or at all events a mild and yielding disposition", "especially adapted for slow, phlegmatic temperaments", and acting "best when there is a disposition to chilliness and adipsia". Compare the Pulsatilla guide.
Nux vomica is "more frequently required by those persons who are of an anxious, zealous, fiery, hot temperament" and suits "the evil consequences arising from drinking much coffee and wine" in a sedentary life; compare the Nux vomica guide. China opens as a polemic against the misuse of cinchona bark; its positive indication is the case "where the sufferings of the patient are solely or chiefly owing to weakness from loss of humors, from great loss of blood", the line behind the China officinalis guide.
Not everything in a preface is a proving: Belladonna's defends "the prophylactic power of belladonna" against "the true erysipelatoid smooth scarlet fever", a clinical claim inside a proving book, to be read as history. The disposition remarks, by contrast, are Hahnemann applying his own rule: the Pulsatilla preface says a medicine suits best when "the mental and emotional alterations peculiar to the drug encounter similar states in the disease to be cured", the totality principle of the Organon in practice.
Fellow provers and old-school sources
Each preface ends with two lists: the provers (Aconitum names "Ahner, Gross, Friedrich Hahnemann, Hornburg, Ruckert senior, Stapf, Wahle") and the "authorities of traditional medicine", Matthiolus, Stoerck, Greding, van Helmont and others, whose observations Hahnemann admitted beside the provings.
Dudgeon states the convention outright: in the third-edition arrangement all symptoms are "numbered continuously; Hahnemann's own observations being distinguished by having no name or sign attached, while those of his pupils are indicated by an abbreviation of the name of each", and the old-school authorities "are named after the symptoms for which they are responsible". So in Aconitum an unmarked line is Hahnemann's; "[Stf. Gss.]" is Stapf and Gross, "[Hbg.]" Hornburg, "[We.]" Wahle, "[Rkt.]" Ruckert; and "[Matthioli, Comment. in Diosc., lib. iv, cap. 73]" is a commentary on Dioscorides, which a Hughes note identifies as aconite given to two criminals to test an antidote. Hughes adds that such cited symptoms "are of very unequal value", poisonings "of unquestionable value" but case narratives needing a discrimination "Hahnemann has hardly exercised": the best argument for reading the marks.
In most chapters the preliminaries close with an edition count, which explains why symptom numbers differ between reprints and between Materia Medica Pura and later compilations:
| Remedy | Fragmenta 1805 | 1st ed. | 2nd ed. | 3rd ed. | Source chapter |
|---|---|---|---|---|---|
| Aconitum | 213 | 314 | 429 | 541 | /acon |
| Belladonna | 405 | 650 | 1,422 | 1,440 | /bell |
| China | 221 | 1,082 | 1,143 | (vol. III stopped at the 2nd ed.) | /chin |
| Nux vomica | 308 | 961 | 1,267 | 1,301 | /nux-v |
| Pulsatilla | 309 | 1,073 | 1,163 | 1,154, "reduced" by "correcting the erroneous enumeration" | /puls |
| Ignatia | 176 | 624 | 674 | 794 | /ign |
| Arsenicum | not in the Fragmenta | 662 | 948 | 1,068 | /ars |
Hughes audited the numbering too; his note at the head of Sulphur reads: "In the original 815 symptoms are reckoned, but this is a mistake on the part of the transcriber, who has counted S. 189 as 190."
The numbered symptoms: head to foot, disposition last
In Pulsatilla, in the numbering of the Dudgeon edition, symptom 1 is "Vertigo"; 50 the occiput ("Headache in the occiput, a rhythmical throbbing. [Hbg.]"); 300 taste ("Bread tastes sour to her and is too dry"); 500 urinary; 900 position in bed; 1000 dreams ("He dreams of quarrelling (aft. 24 h.)"); 1080 to 1100 heat, sweat and anxiety; and from about 1110 the mind, closing at 1154 with "Extraordinarily whimsical and cross with everything, even with himself". The notes cross-refer by these numbers ("note to symptom 520"), so quote the printed Dudgeon numbering; the online reader shows the lines without these numbers, so search a page for the wording instead.
Two teaching points follow. First, the order: head, senses, face, mouth and throat, then stomach, abdomen, stool and urine, genitals, respiration, chest and back, limbs, sleep and dreams, fever, and only then the mind. Kent's Repertory and Boericke's entries put Mind first, which is why a student raised on them opens a Hahnemann chapter at the wrong end.
Second, the timings. Dudgeon's preface explains the brackets: "Here 'm.' means minutes, 'h.' hours, and 'd.' days." In the Pulsatilla chapter "(aft. 1 h.)" appears 24 times and "(aft. 24 h.)" 20 times. These timings are the raw material of the doctrine the Organon sets out in §63 to §65, the primary action of the medicine and the secondary action, or reaction, of the organism, with alternating actions in §115. The China chapter shows it applied: Hahnemann's note to symptoms 504 and 505 reads "The costiveness of China is secondary action or reaction of the organism to the great tendency of this medicine to excite diarrhoea in its primary action", and elsewhere the notes tie symptoms 352 to 355 together as an "alternating action with symptom 356".
A worked reading: from a keynote back to Hahnemann's line
Take the Pulsatilla the textbooks teach: mild, tearful, chilly yet better in the open air, thirstless. Every element is in the chapter.
The temperament and the thirst are in the preface: "a timid, lachrymose disposition", "a mild and yielding disposition", "a disposition to chilliness and adipsia". The weeping is in the mind section at the end: "Sullenness, breaking out into weeping, when interrupted in his work" (1127) and "Very discontented, weeps for a long time, in the morning after waking from sleep" (1129). The open-air modality is among the general symptoms: "The symptoms are ameliorated in the open air (aft. 1/2 h.)" (895) and "He longs for the open air" (897). The thirstlessness sits in the fever section: "Feeling of heat at night without thirst (aft. 36 h.)" (977) and "Febrile chill without thirst; thirst in the heat" (1042).
Now read the other way. Symptom 897 continues: he longs for the open air "and yet the abdominal pain and inclination to vomit in particular, are aggravated in the open air", and 898 is "Sufferings from open air; he dreads it". Symptom 1001, "Cries out and starts up in sleep, terrified about a black dog or cat", never became a keynote, and 1042 records thirst in the heat beside the famous thirstlessness. The keynote is a true summary of the chapter and also a selection from it; the repertories still carry lines the digests dropped, and that is the reason to go back to the source: to see what the keynote kept, what it left, and whether your patient belongs to the part left out. Open the Pulsatilla chapter and search for the quoted wording.
Read it alongside The Chronic Diseases
Materia Medica Pura holds the acute polychrests and the early provings. The Chronic Diseases, four German volumes of 1828 to 1830, enlarged to five in the second edition from 1835, carries the antipsoric remedies; Similia's text is Louis H. Tafel's 1896 translation of that second edition, annotated by Hughes and edited by Pemberton Dudley, 49 remedy pages from the 48 printed divisions. The theoretical first part, with the miasms, sits outside the materia-medica corpus; the miasms guide covers it.
Sixteen remedy names appear in both books: Arsenicum, Aurum (with Aurum muriaticum and fulminating gold), Carbo animalis, Carbo vegetabilis, Colocynthis, Conium, Digitalis, Dulcamara, Guaiacum, Hepar, Manganum, Muriaticum acidum, Phosphoricum acidum, Sarsaparilla, Stannum and Sulphur. One trap: Manganum is one proving under two headings, since Hughes notes that the Chronic Diseases chapter carries the Materia Medica Pura text unchanged, with Nenning's additions, while Similia files the earlier page as Manganum aceticum and the later as Manganum, so the two do not cross-link. For Sulphur, read the chapter of 1825 and the antipsoric Sulphur together.
Where to read Materia Medica Pura online (and about PDFs)
The Dudgeon text is public domain, so PDFs of it circulate: some are library scans, such as the Wellcome volumes on the Internet Archive, others re-typed transcriptions. Similia does not host a PDF. It offers the text as pages: all 67 chapters as 76 remedy pages under the Materia Medica Pura hub, free to read online without an account, in a library that also holds Boericke, Clarke, Kent, Hering and T. F. Allen's Encyclopedia of Pure Materia Medica, the compilation of 1874 to 1879 that folded these provings in with each symptom referenced to its prover. Each remedy page shows the same remedy in the other authors beneath the Hahnemann text, so the cross-reading habit from the Boericke guide works in reverse: Boericke for the digest, Kent for the lecture, Hahnemann for the proving lines, and the glossary entry on provings for what that evidence does and does not establish.
Where the software fits
A source book asks for retrieval, not judgement. Similia Free includes seven classical repertories with AI semantic repertory search, 21 classic materia medica books to read online, and basic case management capped at three new cases and three analyses a month; Materia Medica Pura and The Chronic Diseases are two of the 21 books, free to read online. Pro adds the AI toolkit (Notes-to-Rubric, case analysis, live audio transcription, photo analysis), unlimited cases and analyses, and premium repertories and materia medica. Materia medica search, which is how these two Hahnemann books are searched rather than read, is a Pro feature covering the materia medica sources available with the selected plan and add-ons, including the 21 classic books. The plans comparison has the full breakdown.
Either way, the reading is yours. The software finds symptom 897 in seconds and puts Boericke's line beside it; whether the patient's dread of the open air matters more than the longing for it is the practitioner's call, made from the record rather than the summary.
