PREFACE TO THE SECOND EDITION 



The purpose of this book is to furnish a text-book of hematology 

 for the use of students and practitioners of veterinary medicine. 

 It is also intended to render easily accessible for investigators 

 data concerning the blood of the kinds of experimental animals 

 commonly used. 



Compared with the investigations made on the blood of man, 

 but little has been done on the blood of domesticated animals. 

 Some work, however, has been done. The results obtained are 

 of more value than their mere amount would indicate because 

 we have learned from the studies made that similar pathological 

 processes produce changes in the blood similar to those produced 

 by such processes in man. So the rich results obtained from man 

 are made available to the veterinary practitioner. 



Free use has been made in preparing this book of the standard 

 works on the blood of man. Those of Ewing, Cabot, Da Costa, 

 v. Limbeck, Naegeli and Grawitz were used most freely. Refer- 

 ences will be found in the text to the source from which material 

 has been taken. A list of references is given at the end of each 

 chapter for the use of advanced students. 



In the first edition what was reported by different investigators 

 as normal was given without indicating which of these the author 

 considered more reliable. Undergraduate students and most 

 practitioners can hardly be expected to know what to consider 

 as normal when they find considerable variation. In this edition 

 what is considered to be the normal for each species is stated. 

 Tables summarizing the results obtained by the different investi- 

 gations are also given. 



Ithaca, N. Y. 

 Feb., 1917. 



S. H. BURNETT. 



