. Diseases of the dog and their treatment. nough doses to purge, such as sulphate of mag-nesia or sulphate of sodium, and cold enema and the application of anointment of lead plaster. Any knots may be removed by ligature, scarifi-cation, or by the scissors, and afterward touched by the 82 DISEASES OF THE DIGESTIVE APPARATUS INTESTINAL PARASITES. (Hehninthiasis.) Round Worms, Maw Worms (Ascaris Mystax). Natural History.—The round worm of the dog, ascaris mystax,ascaris marginata, is Avhite or yellowish-white, slightly reddish in colorand twisted in spirals; there is a difference
. Diseases of the dog and their treatment. nough doses to purge, such as sulphate of mag-nesia or sulphate of sodium, and cold enema and the application of anointment of lead plaster. Any knots may be removed by ligature, scarifi-cation, or by the scissors, and afterward touched by the 82 DISEASES OF THE DIGESTIVE APPARATUS INTESTINAL PARASITES. (Hehninthiasis.) Round Worms, Maw Worms (Ascaris Mystax). Natural History.—The round worm of the dog, ascaris mystax,ascaris marginata, is Avhite or yellowish-white, slightly reddish in colorand twisted in spirals; there is a difference in the two sexes (see ), the males are about 6 cm. and the female about 12 cm. Theirthickness varies from 1 to mm. The head is slightly flattened andfitted with two wing-shaped borders, which start from the mouth andenlarge slightly as they pass posteriorly. The mouth is a round smallopening, and fitted with three to six small lips, which cover a number ofproportionately large teeth. The caudal end of the male parasite is n o. Fig. 40.—Ascaris mystax. curved and pointed and has numerous small papillae on each side. Thecaudal end of the female is pointed and straight. The vulva is about theend of the first fourth of the body from the head. In the genital organsthere can generally be seen quantities of round eggs that on examinationare found to have a thick, hard shell, which is marked by numeroussmall grooves. These eggs are found in enormous quantities in thefa*ces of all dogs affected with the round worm (see Fig. 15). The de-velopment of the embryo is not yet thoroughly understood, but from theexperiments of Grassi, Penberthy, Albrecht, Frohncr, it has been dem-onstrated that the intestines of puppies that have never taken any-thing but the mothers milk, contain numerous ascarides, and they havedemonstrated that an intermediate host is not necessary, but the worms canbe developed directly from the eggs in another animal of the same a rule, the round
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