14 PREFACE. 



liberately chosen as complying with what has been con- 

 sidered good pedagogic principles. 



The drugs studied in detail have been carefully selected 

 as those most typical of general drug structures, and it 

 is believed that with the knowledge that may be thus 

 acquired the student of pharmacognosy will be amply 

 equipped to pursue individual research of an economically 

 practical nature. 



New York, October, 1904. 



