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Under the name of bots or maggots, the larvae of certain flies which molest horses, cattle, and sheep are well known. Some of the larvae, as for instance, the warble grub, bury themselves deeply in the tissues of the skin, excite inflammation and suppuration, and do great damage to the hide, which the healing process does not suffice to repair. The larvae of the bot fly are introduced into the digestive organs of the horse without any effort on the part of the fly, which deposits the eggs on the legs, and from this position they are transferred by the animal's own tongue and swallowed. When in the stomach the larvae fix themselves into the mucous membrane, in which they remain secure until they are in a condition to migrate to the outer world and assume the chrysalis stage, and lastly, that of the perfect insect. The reader who has followed the description of the various classes of animals and plants which play the part of parasites to higher organisms, will have realised the importance of the subject of parasitism, not only in relation to the lower animals which play the part of host to the parasite^ but, what is perhaps of even greater consequence, its possible influence on public health. Some forms of parasites are undoubtedly capable of transmission from the lower animals to man. Capsuled Tritchina spiralis, the cysts of the two forms of tape worm, which are found in the intestines of the human subject. One, the Taenia solium, which has its larval form in the flesh of swine, and the other, the Tpenia mediocunnellata, the cystic form of which infests the muscles of cattle in India. Among parasitic plants, the ringworm fungus is readily transmitted to the skin of the human subject, and finds a congenial habitat, producing derange- ments which are often difficult to correct. In the following articles the different parasites which attack the several domesticated animals will be referred to more in detail, and with particular