Dr. D.M. Campbell; to appreciatively credit Drs. L.A. Merillat, A.
Trickett and F.F. Brown for valuable suggestions given from time to
time. Particular acknowledgment is made to Dr. Septimus Sisson, author,
and W.B. Saunders & Co., publishers of The Anatomy of Domestic Animals,
for permission to use a number of illustrations from that work.

J.V.L.

Chicago, Illinois, October, 1916.




_Justice shows a triumphant face at the works of humane practitioners,
who give serious thought and expend honest effort, for the alleviation
of animal suffering._




TABLE OF CONTENTS


Page
Illustrations 7
Introduction 11

SECTION I

Etiology and Occurrence 15