28 INTRODUCTION 



market. The instructor is advised to make all the observa- 

 tions he can on this subject for the benefit of his students. 



One of the most valuable things which a course in ex- 

 perimental pharmacology can offer to a student is the very 

 great opportunity which is presented to develop his power 

 to think, to observe, and to learn at first hand for himself. 

 In nearly all of the experiments questions are asked which 

 are intended to direct his attention to the most vital and 

 important features of the work, and to encourage him to 

 test out experimentally the truth or falsity of his own 

 conclusions. 



Every student of modern medicine must have been im- 

 pressed at some time in his work by the very great aid 

 which he has derived in his study of anatomy or neurology 

 or operative surgery from the use of illustrations, dia- 

 grams, etc, These are frequently of the greatest use for 

 rapidly reviewing work over which one has long since 

 passed, or for quickly advancing one's knowledge into fields 

 with which he may be less familiar. The author has care- 

 fully considered this phase of the subject in writing the 

 present manual. And numerous illustrations, tracings, dia- 

 grams, etc., have been devised and presented with the spe- 

 cial object of enabling the student, teacher or practitioner 

 of medicine to quickly and accurately grasp the full mean- 

 ing and significance of important actions of the drugs con- 

 sidered. To one who already possesses a moderate famil- 

 iarity with the subject of modern pharmacology, a brief 

 glance at the nature of many of the experiments presented, 

 together with a rapid study of the accompanying tracings, 

 may reveal the character and results of the effects which 

 follow the application of drugs to the animal organism with 

 a vividness which can be exceeded only by the knowledge 

 acquired by the actual performance of the experiments 

 themselves. 



Finally it may be stated that originality and individu- 

 ality, not only for the student but for the instructor as well, 



