In short: Classic materia medica can be studied through overlapping formats: proving compilations, clinical digests, keynotes and comparisons, lectures, and analytical synopses. These are practical reading categories, not a universal taxonomy or levels of established treatment efficacy. All 21 books below are free to read on Similia. The downloadable worksheet shows how to compare two actual source entries without turning historical claims into prescribing conclusions.
Ask ten homeopaths which materia medica they open first and you will hear Boericke from most of them, Kent from the constitutional prescribers, Clarke from anyone who has ever needed a remedy the others left out. Ask which one is best and the question stops making sense, because the classic books were written to do different jobs. Some compile proving reports and other substance-associated observations. Some record what their authors reported as clinical successes. Some strip a remedy to the dozen symptoms that identify it; others describe it as a person across thirty pages.
This guide compares the 21 classic books that make up the free library on Similia — what each one is, how it was built, what it does better than the others, and where it fails — so that you can reach for the right one and read it the right way. It draws on the books themselves and on the guides to individual works elsewhere on this blog: Boericke's Pocket Manual, Clarke's Dictionary and Kent's Lectures. If the difference between a materia medica and a repertory is not yet clear, read that explainer first; everything below assumes it.
Five kinds of materia medica
The books use different arrangements and mix proving reports, toxicological observations, clinical reports and author interpretation in different proportions. The five categories below are a teaching aid: a book can belong to more than one, and its preface and individual references matter more than the label.
Proving compilations ("pure" materia medica). Hahnemann's Materia Medica Pura (1811–1821), T. F. Allen's Encyclopedia of Pure Materia Medica (1874–1879) and Hughes and Dake's Cyclopaedia of Drug Pathogenesy (1884–1891) compile historical accounts associated with substances, including proving and other observations. They form a source base for the later literature, not proof that homeopathic treatment is effective. Check each work's inclusion rules and references rather than assuming that every entry is an independently verified proving symptom.
Clinical materia medicas. Hering's Guiding Symptoms (1879–1891), Clarke's Dictionary (1900–1902), Boericke's Pocket Manual (1901) and Farrington's Clinical Materia Medica (1887) include authors' clinical reports and interpretations alongside earlier material. Hering uses historical verification markings; Clarke adds history, causation and relationships; Boericke provides a compact digest. Those editorial conventions are not modern clinical-effectiveness ratings.
Keynote and comparison books. Lippe's Key Notes and Red Line Symptoms, Guernsey's Key-Notes, H. C. Allen's Keynotes and Characteristics with Comparisons (1899) and Nash's Leaders in Homoeopathic Therapeutics (1898) do the opposite of the proving records: they reduce each remedy to the handful of characteristic symptoms that identify it, and set it beside the remedies it is most often confused with. They are the books students memorise from and practitioners confirm with.
Constitutional lectures. Kent's Lectures on Homoeopathic Materia Medica (1905) and Dunham's Lectures on Materia Medica (1878) describe the remedy as a whole person — temperament, mind, reactions to heat, cold and weather, then the particulars — in the order the Kentian method weighs them. They teach how to think about a remedy rather than what to look up.
Analytical synopses. Boger's Synoptic Key (1915) and General Analysis condense each remedy to its modalities, generals and regional affinities in a fixed synoptic format built for the Boenninghausen method, where the generalised modality decides the case.
Two books sit outside the scheme: H. C. Allen's Materia Medica of the Nosodes and Paterson's Bowel Nosodes (1950), which cover remedy groups the general works treat thinly.
The 21 books at a glance
| Book | Author | Year | Kind | Size | Best for | Limit |
|---|---|---|---|---|---|---|
| Materia Medica Pura | Samuel Hahnemann | 1811–1821 | proving record | 6 vols | the original proving symptoms of the remedies Hahnemann proved | no grading, no clinical symptoms, archaic wording |
| The Chronic Diseases | Samuel Hahnemann | 1828 | proving record + theory | 5 vols | the antipsoric remedies (Calc, Sil, Sep, Lyc…) and the miasm theory | same |
| Encyclopedia of Pure Materia Medica | T. F. Allen | 1874–1879 | proving record | 10 vols | checking whether a symptom was actually produced in a proving | exhaustive, unweighted lists |
| A Cyclopaedia of Drug Pathogenesy | Hughes & Dake | 1884–1891 | proving record | 4 vols | full proving narratives with doses and provers | few remedies, narrative form |
| The Guiding Symptoms of Our Materia Medica | Constantine Hering | 1879–1891 | clinical | 10 vols | confirmed clinical symptoms, graded by verification | size; consult, don't read |
| A Dictionary of Practical Materia Medica | J. H. Clarke | 1900–1902 | clinical | 3 vols | lesser-known remedies, relationships, causations, cases | long entries, uneven sourcing |
| Pocket Manual of Homoeopathic Materia Medica | William Boericke | 1901 (9th ed. 1927) | clinical digest | 1 vol | first look at any remedy; modalities, relationships, dose | terse; no mentals to speak of |
| A Clinical Materia Medica | E. A. Farrington | 1887 | clinical lectures | 1 vol | remedies grouped by family and compared in lecture form | dated pathology |
| Materia Medica and Special Therapeutics of the New Remedies | E. M. Hale | 1864 (5th ed. 1880–1882) | clinical | 2 vols | American plant remedies the European books lack | partly non-homeopathic material |
| Keynotes of the Homoeopathic Materia Medica | Adolph Lippe | 19th c. | keynote | 1 vol | the characteristic symptom of each remedy | keynotes without the picture |
| Keynotes and Red Line Symptoms of the Materia Medica | Adolph Lippe | 19th c. | keynote | 1 vol | the red-line symptom that confirms a choice | same |
| Text Book of Materia Medica | Adolph Lippe | 1866 | clinical | 1 vol | Lippe's full remedy descriptions | limited remedy set |
| Key-Notes to the Materia Medica | H. N. Guernsey | 1887 | keynote | 1 vol | short, memorable keynotes for students | brief |
| Keynotes and Characteristics with Comparisons | H. C. Allen | 1899 | keynote + comparison | 1 vol | memorising the leading remedies and their nearest neighbours | selective |
| The Materia Medica of the Nosodes | H. C. Allen | 1910 | specialised | 1 vol | Psorinum, Medorrhinum, Tuberculinum and the other nosodes | one remedy group |
| Leaders in Homoeopathic Therapeutics | E. B. Nash | 1898 (4th ed. 1913) | keynote + cases | 1 vol | moving from memorised keynotes to bedside selection | conversational, uneven |
| Lectures on Homoeopathic Materia Medica | J. T. Kent | 1905 | constitutional lectures | 1 vol | the remedy as a whole person; mentals and generals | long; Kent's opinions |
| Lectures on Materia Medica | Carroll Dunham | 1878 | lectures | 1 vol | clear teaching of the polychrests | small remedy set |
| A Synoptic Key of the Materia Medica | C. M. Boger | 1915 | analytical synopsis | 1 vol | modalities and generals at a glance; Boenninghausen method | telegraphic |
| General Analysis | C. M. Boger | 1930s | analytical synopsis | 1 vol | a short card-repertory of generals | very compressed |
| The Bowel Nosodes | John Paterson | 1950 | specialised | 1 vol | Morgan, Gaertner, Dys. co. and the other bowel nosodes | one remedy group |
Years refer to historical publications, not a guarantee of the printing behind every digital entry. Several works were revised repeatedly. Record an edition only when the source identifies it; otherwise cite the digital entry and access date.
Study Worksheet: Compare Two Original Entries
Download the English printable source-comparison worksheet or editable Word worksheet. Each contains a blank page and a worked example. No registration is needed. The task is to make a source observation another reader can reproduce, not to select a remedy for a person.
A worked Boericke and Kent comparison
Reading question: How do the two Nux vomica entries organise their descriptions of sensitivity?
Open Boericke's Nux vomica entry and Kent's Nux vomica entry. Both are free public reading. These digital English entries were checked on September 6, 2026; their individual texts do not establish a print edition, so the worksheet cites the book, entry, section and access date without inventing a page number.
The short excerpts and the Mind locator below remain in English so they can be found verbatim in the checked entries.
| Source and location | Short source excerpt | Observation about the format |
|---|---|---|
William Boericke, Pocket Manual of Homoeopathic Materia Medica, Nux vomica, Mind |
Cannot bear noises, odors, light |
A short regional section makes the wording easy to locate. Head and Eyes follow as separate headings. |
| James Tyler Kent, Lectures on Homoeopathic Materia Medica, Nux vomica, opening paragraphs | oversensitive to noise, to light |
The lecture introduces the theme before the Mind heading and develops it across longer passages. |
Interpretation: the passages overlap in their emphasis, while the arrangement differs. Boericke provides a compact digest; Kent develops an explanatory narrative. Agreement does not show that the authors observed the same thing independently, that a treatment works, or that the entry fits a particular person. Historical language elsewhere in these entries reflects the authors' period and should be read as such.
Uncertainty to retain: these two excerpts do not identify all the underlying sources or the printing behind each digital transcription. Read the surrounding sections, examine references where supplied, and check a title page before adding an edition or page citation. Do not turn an unsuccessful search into a claim that a symptom never appeared in the literature.
Repeat the exercise and check the result
- Choose one narrow reading question and confirm that both entries refer to the same remedy identity.
- Record each author, full book title, known edition or digital-source limit, and exact entry/section or page. Keep a short quotation separate from your paraphrase.
- Describe one agreement and one difference in wording, arrangement, scope or emphasis. Avoid deciding which author is “right” from repetition alone.
- Name what remains unknown and the next source that could resolve it. Return later without the worked page and check whether you can reproduce the references.
Classification exercise: Which of the five formats above best describes each example, and can either label stand for an efficacy grade? Answer: Boericke is usefully read as a clinical digest and Kent as a lecture, but the categories overlap and neither is an efficacy grade. A successful worksheet has accurate, findable references and conclusions limited to what was read.
Use the read and switch sources guide to repeat this with another entry. Paper or an editable document is sufficient. Pro materia medica annotations and My Notes are optional study conveniences, not prerequisites for the exercise.
How the books were built, and why it matters at the desk
The proving records are the bottom of the pyramid. When Allen lists three hundred symptoms for a remedy, he is reporting what provers wrote down, in their words, with no judgement of importance. That is exactly what you want when a repertorisation throws up an unfamiliar remedy and you need to know whether its listing under a rubric rests on a real proving symptom or on a single clinical claim. It is exactly what you do not want when you are trying to learn what the remedy is like.
The clinical materia medicas are the middle. Hering's Guiding Symptoms is the model: symptoms drawn from provings and cures, each marked with a grade of verification, arranged in a fixed head-to-foot schema. This is where the confirmed symptoms live, and it is why Kent's higher rubric grades trace back to Hering so often. Clarke does the same job with more narrative and far more remedies, and adds the sections that make his Dictionary indispensable for the second prescription: causation, relationships, and the cases the remedy has cured. Boericke compresses the whole edifice into a page per remedy and adds the one thing none of the others give reliably — the dose.
The keynote books and the lectures are the top: interpretation. Lippe, Guernsey, H. C. Allen and Nash decided, from experience, which few symptoms identify each remedy; Kent and Dunham decided how the remedy hangs together as a temperament. They are the most useful books to a student and the most dangerous, because a keynote lifted out of the totality will confirm almost any remedy you already had in mind. The classic advice still holds: learn from the keynote books, prescribe from the totality, and check in Hering or Clarke.
Which book for which job
You have a remedy from the repertorisation and want a fast picture of it. Boericke. One page, head to foot, modalities and relationships at the end. If the remedy is a polychrest, follow with Kent's lecture on it.
The repertorisation crowns a remedy you half-know or do not know at all. Clarke. His Dictionary covers over a thousand remedies with the history and the clinical uses that explain why the remedy appears in the rubric. Then Hering, if the remedy is one of his four hundred, to see which of its symptoms are actually confirmed.
You want to know whether a rubric listing is real. T. F. Allen's Encyclopedia. Find the symptom in the proving. If you cannot find it there or in Hering, record it as unresolved and check the repertory's actual reference. Absence from two books does not establish that a listing is a clinical addition.
You are learning the polychrests. H. C. Allen's Keynotes for the characteristic symptoms and the comparisons, Nash for the same material taught through cases, Kent's Lectures for the constitution. The student guide to the polychrests sets a reading order.
You work in the Boenninghausen method. Boger's Synoptic Key, whose entries are ordered by the modalities and generals the method weighs, and the General Analysis beside it.
The case is a nosode case. H. C. Allen's Nosodes for Psorinum, Medorrhinum, Tuberculinum, Syphilinum and their relatives; Paterson for the bowel nosodes, which the general books barely mention.
You need the American plant remedies. Hale's New Remedies: Hydrastis, Gelsemium, Caulophyllum, Phytolacca and the rest were largely his introductions.
Reading them together
The books cross-reference one another whether their authors intended it or not. A rubric in Kent's Repertory can lead to Kent's Lecture; a comparison in H. C. Allen can lead to another remedy in Hering, T. F. Allen or Hahnemann. A digital library makes following those references easier, but note which authors and search modes are available in the account. The guide to searching the materia medica online shows the workflow.
Where the classics stop, and what the modern books add
The classic materia medicas stop, for practical purposes, in the 1920s. Boericke's ninth edition (1927) and Boger's later work are the last of them. Three things happened afterwards that the classics cannot give you.
Murphy's Materia Medica and Repertory reorganised the classical material in clinical, alphabetical language and added modern provings. Vermeulen's Concordant, Prisma and Synoptic series collated the classical authors remedy by remedy with the sources marked, and added the natural history of the substance. Scholten's element and plant theory added a way of reading remedies by family that the classics never had. Those modern books require the relevant Pro access on Similia, while the 21-book classic library is free to read on every plan.
The Free plan includes public reading of all 21 classic books, seven classical repertories with semantic search, and basic case management with three new cases and three analyses per month. Materia medica semantic search requires access to eligible paid sources. The Pro plan adds premium content, unlimited cases and analyses, and the AI toolkit with its applicable credit allowance. Start the source study with Boericke and Kent, then compare the references in Clarke and Hering.
