PAEASITIC DISEASE OF LUNGS. 369 



are healthy. Nor, I conclude, is it restricted to any specific 

 locality, since I have found it at every place in Great Britain, 

 France, Germany, and Switzerland that I have happened to 

 visit. The lungs, then, of any full-grown sheep, taken indis- 

 criminately, will be found to contain, and often to be thickly 

 studded with, small nodules, varying in size from a pin's head 

 to a barleycorn, or larger. The cysts are full of clear fluid, 

 and contain cysticerci hanging upon an epithelial lining 

 membrane. The firm, soft deposits consist of granule cells 

 and molecular matter, in which minute ascaris like worms 

 are found. The gritty nodule is one or other of these, which 

 has undergone calcareous transformation. The particular 

 point bearing upon my subject is, that the pulmonic affection 

 does not prevent the sheep from furnishing excellent mutton." 

 Further on Mr Hall has introduced a diagram to show the 

 changes undergoing around the germs of the strongylus in 

 the lung tissue, and says that there is nothing during the 

 lifetime of the sheep to lead us to infer that it suffers pain, 

 distress, or constitutional disturbance during the formation 

 of this boundary of plastic inflammation around the nodules 

 in its lungs. 



Dr Eanke exhibited at the Pathological Society, on Tues- 

 day, November 3, 1857, the lungs of three sheep affected with 

 the disease, and he carefully described the morbid changes 

 due to the parasites. 



On examining the sheep slaughtered, we find that the larger 

 number of them are fat and robust, yielding wholesome meat, 

 but there is likewise a per-centage, and not a small one, con- 

 veyed to the butcher, because feeding cannot improve them, 

 and to allow them time would be to allow them time to die 

 by the disease. That the development of the germs in the 

 lungs is always unattended with the slightest inconvenience, 

 is not the case, and though the worms may not have found 

 VOL. ii. 3 S 



