This Primer aims to present the characteristic features of the most important drugs used by Homœopathic physicians. It may serve to refresh the mind of a physician when away from his complete symptomatology, it will help him discriminate when studying an unfamiliar pathogenesis. In its preparation comparisons are omitted; these must be looked for in Bœnninghausen's Therapeutic Pocket-Book. A word of caution to the would-be therapeutist must be uttered, namely: Do not use this book, nor the "pocket-book," instead of a more complete symptomatology; these works are intended simply to be suggestive; especially is this caution needed as regards the use of the "pocket-book;" it is not to be used for isolated symptoms, only to aid when a full picture of the patient is taken. Then only can the conditions be grouped and sifted, the sensations and localities taken into account, and the drugs which best cover all of these points, considered; even then a drug which fully agrees with all the general features of the case should be studied in its original records before it is prescribed, unless the prescriber be perfectly familiar with it, which is rarely the case. Homœopathists are too ready to prescribe for single, prominent symptoms, selecting sometimes a different drug for each symptom, when, in reality, the patient's symptoms should all be taken as a unit and a single drug selected to cover the whole; if not every peculiar sensation or locality, yet to cover the peculiar genius of the case, ascertained by properly grouping all of the conditions of the patient. The hunting down of isolated symptoms may be said to be unsatisfactory, for by so doing one avoids the general review of the whole case as an entity; and while it is now and then necessary to prescribe for some single distressing symptom, ignoring all the rest of the case, it must be confessed that thereby, as a rule, little progress is made toward a real cure. Let one always endeavor to take in the entire case and select the corresponding remedy. This Primer is designed to give the "gist" of each drug rather than its symptomatology.T. F. Allen