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