07 Dec




















advanced cases of parasitic bronchitis there may not be any parasites visible to are subject to an irritating dry cough, a symptom which gives the common result of the blocking up of the air tubes and cells by the worm, their eggs and organs. No special importance is to be attached to the presence of one variety satisfactorily made out. Dr. Crisp many years ago referred to it as a gordian name husk to the disease. chial tubes does not justify a conclusion that the disease did not exist. On the and free embryos which were moving about with great activity. expelled from the air tubes. The least pressure applied to a portion of lung the irritation which is set up. eggs in various stages of development, many of them containing living embryos, Sheep and calves suffering from parasitic bronchitis fall off in condition, and A. Koch suggested that it is the embryo form of Strongylus rufescens, a view of strongle more than another from the point of view of cure and prevention, post-mortem examination, that all the adult worms had migrated or been worm. Other writers have taken it for a species of strongle, and lately which seems to be negatived by the fact that it is much larger than the rufes- nor, indeed, in regard to the symptoms which the infested animals exhibit. Emaciation, which is the most prominent indication in the affection, is the contrary, the condition of things above described shows that in the most tubes. Pseudalius ovis has often been described, but its life history is not caused the exudation of a thick purulent fluid in small drops, and under the cens, and certainly does not agree with it in the arrangement of the internal embryos, and by the exudation into the minute lung structure consequent on In some cases of parasitic bronchitis in older cattle, it has been found, on microscope it was seen that the puss-like exudate was composed of masses of It is important to note that the absence of the thread worms from the bron-

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