In addition to the consultation of standard works bearing on various phases of the subject of lameness, the author wishes to thankfully acknowledge helpful advice and assistance received from the publisher, 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 Affections of Bones 15 Rarefying Osteitis, or Degenerative Changes 16 Fractures 16 Affections of Ligaments 20 Luxations--Dislocations 21 Arthritis 22 Affections of Bursae and Thecae 27 Affections of Muscles and Tendons 28 Affections of Nerves 30 Affections of Blood Vessels 31 Affections of Lymph Vessels and Glands 32 Affections of the Feet 34 SECTION II Diagnostic Principles 37 Anamnesis 38 Visual Examination 39 Attitude of the Subject 41 Examination by Palpation 43 Passive Movements 47 Observing the Character of the Gait 48 Special Methods of Examination 53 SECTION III Lameness in the Fore Leg