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strongles deposit eggs in the bronchial tubes and lung tissue ; that the embryos rufescens is distinguished from the Strongylus filaria by its small size, and red or yellow tint. It is sometimes found in association with the filarise in the bronchial In the sheep the Strongylus filaria, a thread-like strongle, is more often found. fact, however, lost some of its significance in consequence of the further dis- So far as the enquiry has extended, it may for the present'be assumed that new surroundings by such changes of form as may be necessary, they must be covery of the presence of embryos in the worms from other pastures at all they undergo certain changes, Avhich fit them for residence'in the system of the larynx and down the trachea into the bronchial tubes. Others will most mammalia. At this stage the embryo is cast out by the earthworms, and eaten In the calf the most common is the Strongylus micrurus, a short-tailed strongle. are fully formed and often hatched in the lungs, and are expelled in the act of Two nematodes are also seen in the lungs of sheep the Strongylus either expelled or digested. It is quite certain that typical lung strongles are probably ascend the nasal chambers, and enter the wind pipe that way. by grazing animals. Some of the young worms will find their way into the small cavities, or inclosed in little masses of calcareous matter. Strongylus abundance during the summer and autumn, but not during the winter. This rufescens, and the worm which has recently been described as the Pseudalius times of the year. coughing ; falling on the pasture, they are swallowed by earthworms, in which traced any further ; but if they do not remain and adapt themselves to their Those which get into the digestive system cannot be, or at least have not been, not found in the digestive organs. ovis, a long thread-like worm which is found coiled up beneath the pleura in SEVERAL VARIETIES of strongles are found in the lungs of cattle and sheep.