PREFACE TO THE SECOND EDITION 



The first edition has been exhausted fqr some time, but a series 

 of circumstances, in part incident upon the World War, made it im- 

 possible to prepare the second edition at any earlier period. The book 

 has been almost entirely rewritten and includes much new subject- 

 matter. The drawings used with the first edition have been gone over 

 carefully, making desirable changes and additions. Many new illus- 

 trations have been added. The drug descriptions have been largely 

 rewritten, making them more complete. There is now included a 

 statement of the ash content and the more common adulterants of 

 each drug. The keys to the identification of the simple vegetable 

 powders have been carefully revised and many additions made thereto. 

 Keys to the identification of the compound powders of the United 

 States Pharmacopoeia (U. S. P.) IX and the National Formulary 

 (N. F.) IV, have been added, also a chapter on quantitative micro- 

 scopic determinations. 



The book is believed to be complete and up to date. It is intended 

 to serve three distinctive though closely correlated purposes, as follows: 



1. As a laboratory guide and text-book for students of pharmacog- 

 nosy in all colleges of pharmacy. 



2. As a companion book to that part of the U. S. P. dealing with the 

 microscopic descriptions of vegetable drugs. 



3. As a practical reference manual for the practising pharmacist, in 

 determining the quality and purity of the vegetable drugs used by 

 him. 



A. S. 



LINCOLN, NEBRASKA. 

 December, 1920. 



