8 PREFACE 



has been changed to "Principles of Veterinary Science" as 

 the contents have been amplified, better to meet the growing 

 needs of the animal husbandman. 



For valuable assistance in the preparation of the manuscript 

 I am greatly indebted to my colleague, Professor A. S. Alexander. 



F. B. H. 



Madison, Wisconsin, 

 January, 1920. 



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