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PREFACE. 



THIS volume represents in a more formal setting the notes 

 which the author has been in the habit of issuing to students 

 attending the ordinary course of Practical Physiology in this 

 College. 



The aim has been to supply the student with concise 

 directions for performing the work which he has to do with 

 his own hands in class. 



The choice of methods has been necessarily governed by 

 their adaptability to class purposes, and as much as possible 

 also by their simplicity. 



In order that the student may read beforehand the work 

 that is to engage his attention at the next meeting of the 

 class, the subject matter has been divided into lessons, which 

 are indicated by marginal numbers. 



Illustrations have been omitted from the section on Histology, 

 as it is essential that the student should systematically practice 

 drawing from the preparation itself uninfluenced by the sug- 

 gestions of a drawing ready to his hand. 



He is thus led to form his own opinion of what he himself 

 sees, and is encouraged to cultivate and to rely upon his own 

 powers of interpretation. 



For the same reasons tracings have been omitted from the 

 Experimental Section. 



A system of abbreviated references to the Appendix has 

 been employed in those cases in which sections of tissues are 

 given to the class ready for mounting, by which means the 

 methods of preparation can be found in full. 



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