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embryo towards maturity which have not been traced. Iii one very important particular the development of the lung strongle differs from that of the tapeworm and fluke worm. The eggs of strongle undergo development even while in the uterus, and they are deposited in the lung tubes with the embryos in them in a state of active vitality. While watching the moving embryos in eggs, it will be seen that many of them succeed in breaking the shell in which they are enclosed, and escaping into the bronchial tubes or the air cells. What becomes of them after their escape is not clearly known. Hundreds of them are expelled by the animal during the act of coughing, but many remain, and it is not determined whether or not they become mature without passing through the organism of an inter- mediate host. Although this form of development must be accepted as possible, it cannot be denied that there are some facts which do not support the view ; for example, while the living embryos are found abundantly in the living tissues along with eggs in various stages of development, not intermediate stages are met with. On the other hand, there is no doubt that an immense number of eggs and embryos are constantly being expelled from the breathing organs, and these, falling in the pastures, are swallowed by earthworms, in the digestive organs of which they undergo changes of skin, acquire a well-defined digestive system, and there also takes place a sufficient development of the sexual organs to enable the observer to distinguish the sex of the young worm. It may be presumed that young strangles, after being retained in the digestive canal of the earthworm until the sexual system is well advanced, will be ejected with the ordinary excreta, or worm casts, as they are called, and be taken up by the animals which are grazing on the infected pastures. This view ts considerably strengthened by the fact which has recently been observed, that worms taken from certain pastures at regular intervals contained embryos in