=Bot-Fly of Cattle or Warbles.=--It is now believed that eggs are deposited near the feet and that the grub is taken into the mouth and becomes partially developed in the digestive tract. It then burrows through the tissue until it reaches the region of the back. The only treatment that will amount to much is to destroy the grub as it is developing under the skin. If farmers and stockmen will systematically do this they can soon lessen the damage done. The heel fly annoys cattle, and the grub, when it escapes from the back, leaves a hole in the best part of the hide, causing loss in this way. After the grubs are in the back no treatment helps the animal very much; but the grub can be killed, thus preventing their developing into flies that would annoy other cattle. The grubs may be squeezed out and destroyed. Mercurial ointment may be rubbed through the hole and kill the grub, or chloroform, or creoline, may be injected into the grub with a hypodermic syringe. It does not require very much time to look after the number of cattle usually found on a farm. =The Bot-Fly of Sheep= is a very troublesome pest at times, and always causes trouble and annoyance to the flock when present, and occasionally causes considerable financial loss. The fly attacks sheep during the warm months, July and August generally being the worst. The presence of fly in the flock is easily told by the behavior of the sheep. The fly looks much like a house fly, only it is longer and it always attempts to lay its eggs just inside of the opening of the nose. As soon as the fly begins to get near the nostril the sheep will begin to run, will hold their noses close to the ground, and frequently huddle together as closely as possible for protection. When the fly does succeed in depositing the larvæ it begins immediately to work its way up the cavity of the nose and finally gets into the small cavities in the head, where development goes on. It is during this period of development in the head that most of the damage is done. As the grubs grow larger a discharge from the nostril is noticed, which may soon become very thick and sticky, gumming up the nostrils and making breathing difficult. The sheep will often carry their heads low, but will frequently raise their heads and point their noses straight up.