The first edition of this book was only about half the size of the second, as it was prepared somewhat hastily for a special purpose, but Dr. Allen took his time to the second edition, and gave the world a well rounded out and complete standard book on homœopathic Materia medica. We do not mean that the first edition was faulty as to its matter, for it was used unchanged in the later edition, but it did not embrace a sufficient number of remedies. As Dr. Allen died before a third edition was needed we concluded to bring it out unchanged. It is a master piece of materia medica work; its symptomatology is made up of the unchanging land-marks of our remedies that are in constant use; it is, in short, a book that needs no revision.

The Publishers.

Philadelphia, Pa.