PREFACE TO THE THIRD EDITION. 



IN the light of extended experience in teaching Practical 

 Physiology, I venture to submit a Third Edition of this little 

 work. The essential features remain unchanged; but there has 

 been some re-arrangement of the subject-matter, and many addi- 

 tions have been made, including a short Appendix on Recording 

 Apparatus. 



In preparing the Chemical Part, I have made use of the Text- 

 books of Gamgee, Halliburton, Neumeister, and Salkowski ; while, 

 for the Experimental Part, I found numerous valuable suggestions 

 in the practical works and syllabuses of my friends, Professors 

 Gotch, Halliburton, Fredericq, and Dr Schenk. I have to express 

 my thanks to Professor Fick of Wiirzburg for several improvements 

 in the Lessons on Muscle. 



A large number of new woodcuts have been added (chiefly in the 

 Experimental Part) ; and for communications and several original 

 drawings some of the latter illustrating new methods described 

 by their authors I am indebted to my friends and colleagues, 



