Ascarides, in zoology, belong to the order of vermes, and are divided into two species : 1. the vermiculaiis, distinguished by a transverse mouth, and faint annular rugae, or folds. It is about a quarter of an inch in length, and is found in boggy places ; in the roots of decayed plants ; and very frequently in the rectum, or straight gut, of children and horses. 2. The tumbricoides, which is equal in length with the lumbricus terrestris, or common earth-worm, but wants the protuberant ring towards the middle of the body, which is its only distinguishing mark. Its body is cylindrical, subulated at each extremity; but its tail is somewhat triangular. This is the worm which is most commonly found in human intestines, and its usual seat is the rectum. The symptoms are, an uneasiness and intolerable itching in the anus, which generally take place in the evening, and sometimes prevent sleep. They are often attended with so considerable a degree of heat, as to produce both an external and internal swelling in that intestine ; which, if not quickly relieved, bring on a tenesmus, or a frequent inclination to go to stool, accompanied with a mucous dejection. There are also frequent griping pains, in the lower part of the abdomen, a little above the os putts ; If these be acute, they are succeeded by a bloody mucous discharge, in which these worms are often found alive. Mucus, or slime, appears to be the proper nest of the ascarides: in this they live, are nourished, and preserved unhurt, though surrounded with many other fluids, the immediate contact of which would to them prove fatal. Pur. by lessening this viscous matter, never fail to relieve the patient; for those worms, which are not expelled by the increased vermicular motion of the intestines, for want of a proper quantity, languish, and at last die; as may be seen in those which are taken out of their mucus and exposed to the open air. * Such purges, therefore, as act briskly, and can be conveniently repeated, for instance, purging waters, and jalap, especially for children, two grains of which may be mixed with sugar, and taken daily, are the most effectual. When the tenesmus, or mucous stools, are urgent and distressing, a clyster of warm milk and oil will afford immediate The most usefuj purge is c'iunabar and rhubarb, of each half a drachm, which, when taken, seldom fail to bring away a transparent mucus, containing many of those, worms alive. Various other remedies have been employed in the removal of this troublesome complaint, of which quicksilver, calomel, and powder of tin, are the principal. The inhabitants of Jamaica are said to use the Geoffraea-inermis, or cabbage bark, with singular success. Dr. Duguid, a surgeon of that island, declares, that it is the most sale, and yet most powerful, vermifuge ever known, and that it frequently brings away as many worms by stools, as would fill a hat. He owns, however, that it sometimes produces violent effects, but these take place only, when it is used in the form of a strong decoction, instead of small doses of the powder. Yet we cannot, on this occasion, omit to warn every affectionate parent, against tampering with such powerful remedies as may prove destructive to their children ; nor to trust to the impudent assertions of daring advertisers of vermifuges. - See WORMs.