. Le chien comme porteur de parasites et de maladies. Les chiens en tant que porteurs de la maladie ; les chiens. 338 Circulaire, U.S. DEPT. D AGRICULTXJRE a examiné avec les faibles pouvoirs du microscope. Chaque fois que possible, cet examen doit être effectué par une autorité vétérinaire ou biologiste, comme ces acariens sont souvent difficiles à détecter. Les conclusions des acariens est suffisante pour confirmer le diagnostic de gale, mais failiu-e pour trouver les acariens, même s'il établit une présomption que la maladie n'est pas la gale, ne prouve pas le cas, comme les mites peuvent être négligés ou n'est pas atteint par le grattage. Les symptômes de la gale sarcoptique.

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. The dog as a carrier of parasites and diseases. Dogs as carriers of disease; Dogs. CIRCULAR 338, U. S. DEPT. OF AGRICULTXJRE examined with the low powers of the microscope. Whenever possible this examination should be made by a competent veterinarian or zoologist, as these mites are frequently difficult to detect. The finding of the mites is sufficient to confirm the diagnosis of mange, but failiu-e to find mites, while it establishes a presumption that the disease is not mange, does not prove the case, as the mites may be overlooked or not reached by the scraping. Symptoms.—Sarcoptic mange affects dogs of all ages and all breeds. It usually begins about the head and may spread over the entire body in the course of a month. It appears first in the form of red points which soon become papules or vesicles, most easily seen where the skin is thin and without pigment, as on the abdomen. As the mite bur- rows into the skin it causes irritation and there is an exudate of serum. As this constant flow of serum dries it forms the char- acteristic scab. Simultaneously this irritation gives rise to itch- ing, which becomes intense in the presence of heat or after ex- ercise, and the animal scratches and rubs the affected portions of the body. In doing so it rubs off the scabs and opens up sores. Bacterial infection of these areas may add to the in- flammation and injury resulting from the presence of the mite and the scratching. The hair also may become matted and fall out. There is evidently more or less toxic absorption from the mites or from the dis- eased skin, as shown by a blood reaction in the form of an eosino- philia, a condition frequently associated with parasitism, and the presence of the toxins and the loss of nervous energy due to constant itching and irrita- tion cause the animal to become weak and thin. The skin may show large sores, and the mangy or "mousy" odor becomes very pronounced. A general impairment of digestion and other body activities

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