PREFACE TO FIRST EDITION vii 



to learn all the various instruments which he will never 

 require in his practice. 



I have pleasure in acknowledging the kindly help which 

 I have received from many of my friends. Drs. Gibson, 

 Bruce, Gulland, Dunlop, Boyd, and Ballantyne have given 

 me the benefit of their criticism on those sections of the 

 book which bear upon the parts of medical science with 

 which each of them is specially conversant. I desire also 

 to record my thanks to my class assistants, Dr. Goodall, 

 Messrs. Barcroft, Kidston, and Mackenzie for help in revising 

 the proofs, and to Mr. Graham Brown for some of the 



histological diagrams. 



D. N. P. 



