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^[[3]] THERE REMAINS THEN ONLY THE PHYSICAL RELATIONS OF DRUGS TO BE CONSIDERED AND OF THESE THE NATURAL SOURCES FROM WHICH DERIVED FURNISH THE MOST READILY AVAILABLE, AND THE MOST COMPREHENSIVE GROUND FOR A CLASSIFICATION. IN VIEW OF THESE CONSIDERATIONS THE FOLLOWING HAS BEEN ADOPTED: CLASSIFICATION AND ARRANGEMENT OF THE MATERIA MEDICA COLLECTION. PRIMARY DIVISIONS. I. ORGANIC MATERIA MEDICA. 1. ANIMAL PRODUCTS. 3. VEGETABLE PRODUCTS. 3. PRODUCTS OF FERMENTATION AND DISTILLATION. II. INORGANIC MATERIA MEDICA. [[strikethrough]] I. [[/strikethrough]] 1. THE ANIMAL PRODUCTS ARE ARRANGED ACCORDING TO THE ZOO^[[lo]]GICAL POSITIONS OF THE ANIMAL FROM WHICH THE DRUG IS DERIVED, FOLLOWING THE USUAL CLASSIFICATION, AND BEGINNING WITH THE [[underline]] CLASS [[/underline]] MAMMALIA, [[underline]] ORDER [[/underline]] CARNIVORA. 2. VEGETABLE PRODUCTS ARE CLASSIFIED ACCORDING TO THE BOTANICAL AFFINITIES OF THE PLANT FURNISHING THE DRUG, AND THE AUTHORITY FOLLOWED IS THAT OF BENTHAM AND HOOKER'S ''GENERA PLANTARUM'' FOR THE PHAENOGAMOUS PLANTS, AND LUERSSEN ''MEDICINISCH PHARMACEUTISCHE BOTANIK'' FOR THE CRYPTOCAMS. 3. PRODUCTS OF FERMENTATION AND DISTILLATION INCLUDE THE PRODUCTS OF THE ACETOUS AND VINOUS FERMENTATIONS, AND THE DERIVATIVES: CHLOROFORM, ETHER, ETC., AS WELL AS DISTILLATES, SUCH AS CARBOLIC ACID, PYROLIGNEOUS ACID, ETC. THIS DIVISION IS NOT SUB-DIVIDED.