VI PREFACE. 



and such as are readily obtainable. By this means a large 

 class can carry on the work together. Complicated ex- 

 periments have been omitted or put in small type for 

 the use of advanced students or those who choose to 

 spend more time upon the subject. 



The animal substances which are required albumin, 

 blood, bile, and others can be found in the market or 

 obtained from the slaughter-house. If no hospital is 

 near, gastric juice, urine, etc., corresponding to patho- 

 logical specimens can be prepared artificially for testing 

 by the student. The expense of the course is very small. 



ELBERT W. KOCKWOOD. 



UNIVERSITY OF IOWA, 

 JULY 31, 1899. 



