Clarke's Dictionary is a secondary materia medica. It is based on the proving materia medicas, the primary materia medicas. But because it's secondary literature in homeopathy, the structure of the information of the remedy is much more organized than the structure in the originals that just list the provings. So that's why, for example, Clarke and Boericke's materia medica are so useful, because they have a structure. Clarke, furthering the materia medicas of his day offers proving information and new remedies that no other materia medica had. For example, he added Radium bromatum in his third edition. This tradition has been carried on by many others.
A Dictionary of Practical Materia Medica (3 vol.), 1900
"If some are inclined to object that I have included too many," he says in his preface about the remedies, " I reply that my work is a Dictionary, and I have never yet found a Dictionary that explained too many words." Well-organized and the most detail of any reference.
1200+ remedies. Homeopathic and herbal materia medica combined. Covers the historical uses, folklore, legends, case histories, therapeutics, toxicology, provings, and pharmacy, etc.
Synoptic Materia Medica, 1992
194 remedies. Originally compiled as a remedy summary for the Finnish and Irish Schools of Homoeopathy. Summarized into mentals, generalities, and physical symptoms. Includes organ affinities and modalities taken from Boger's Synoptic Key of the Materia Medica. Leading symptoms are followed by repertory rubrics from van Zandvoort's Complete Repertory. These are followed by food symptoms and a summary of the remedy picture.
Synoptic Materia Medica II, 1996
338 remedies. Because of how well the first volume was received, Vermeulen had to do another one. Includes background information including botanical relationships as well. A comparison section for a look at where to start for reviewing like remedies. Many small remedies from new provings such as Jeremy Scherr's Chocolate or Hydrogen and Nuala Eising's Granite.