For centuries the clinical and curative conception of medicine has dominated medical thought and procedure, practically to the exclusion of all other phases of this great art and science. It has been so uppermost in the minds of most medical authorities until quite recently that they were and many are today almost entirely oblivious to other potent measures and practices that so materially contribute to the well-being of the animal organism. Thus our domain of service has been rather strictly confined to diagnosing, prescribing and administering to animals in which a pathological state actually exists. At the same time the major problems of prevention, control, suppression, and possible eradication of disease have been blissfully ignored....