vi PREFACE. 



The teacher will find the following reference-books to 

 be valuable in experimental physiology: Stirling's " Out- 

 lines of Practical Physiology" (P. Blakiston, Son & Co., 

 Philadelphia); Foster and Langley's " Practical Physi- 

 ology" (The Macmillan Co., New York); Klein's "Micro- 

 Organisms and Disease" (The Macmillan Co., New York). 

 Additional exercises are suggested in "Outlines of Ke- 

 quirements in Anatomy, Physiology, and Hygiene " (Har- 

 vard University). 



Suggestions for many of the following exercises were 

 found in the publications of J. Y. Bergen, B. P. Colton, 

 H. Newell Martin, H. P. Bowditch, M.D., and in the 

 books mentioned above. Much of 'the outline for the 

 study of bacteria was suggested by Dr. T. M. Pruden, 

 College of Physicians and Surgeons, N. Y. Many valuable 

 suggestions have been given by Dr. C. B. Davenport of 

 Harvard University. I am especially indebted to Dr. 

 Margaret B. Wilson of the N. Y. Normal College for 

 careful criticism of my manuscript, and to my colleagues 

 in the biological department of the school for their sug- 

 gestions. 



The cut of the microscope on p. 109 was kindly loaned 

 by Bausch & Lomb Optical Company. Most of the other 

 illustrations were prepared from drawings made by one of 

 my first-year pupils, Miss Marietta P. Gates. 



J. E. P. 



THE MOKRIS HIGH SCHOOL, 

 YORK CITY, Oct. 1, 190. 



