PREFACE TO FOUETH EDITION 



In the preparation of the fourth edition of this work, 

 very considerable revision was made necessary on account 

 of the many changes made in the eighth decennial revision 

 of the tJnited States Pharmacopoeia of September, 1905. 



To what an extent revision was required will be realized 

 when it is known that there have been 123 additions, 106 

 changes in the strength of preparations, and 139 changes in 

 the official title oE drugs in the new Pharmacopoeia. 



Thus the doses of many preparations have suffered the 

 most radical change ; e.g., the dose of tincture of aconite is 

 three times what it formerly was, and that of the tincture of 

 strophanthus is but half the former dose. Some of the most 

 familiar of our old friends are scarcely recognizable by their 

 new names, e. g., Acetphenetidum (phenacetin), Arseni Tri- 

 oxidum (acidum arsenosum). Phenol (acidum carbolicum), 

 Spiritus Glycerylis Nitratis (Spiritus Glonoini), etc. All 

 Extracta Fluida have been changed. Thus no longer we 

 write Extract! Nucis Vomicae Fluidi, but Fluidextracti Nucis 

 Vomicae. The official names of many salts are altered: 

 hydrochlorate into hydrochloride ; hydrobromate into 

 hydrobromide ; and valerianate into valerate ; with cor- 

 responding changes in the Latin terminations. While some 

 of the changes in the new Pharmacopoeia do not affect vet- 

 erinarians, yet professional prudence and pride demand 

 that the veterinary practitioner conform to many of them to 

 avoid mistakes in dosage and nomenclature. 



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