DISEASES OF THE SPLEEN AND PANCREAS. 741 



'whicli the cellular elements are numerous, are of a greyisli 

 colour and soft brain-like consistence, much resembling en- 

 cephaloid cancer. These often attain an enormous size, and 

 infiltrate the neighbouring structures. They have been called 

 by Virchow lympho-sarcoma. Those which are more slowly 

 developed, and in which the reticulum constitutes the greater 

 portion of the growth, are much harder in consistence, sometimes 

 being almost cartilaginous. 



I have never witnessed the lympho-sarcoma of Virchow. In 

 the case from which the figure was drawn, the tumours, although 

 in the aggregate weighing so heavy, were individually no larger 

 than a thrush's egg, and were moderately firm in consistence. 



The origin of these tumours is a matter of obscurity. I have 

 seen them in the well and in the ill fed animal. 



The above remarks will apply to diseases of the pancreas. It 

 must be, however, held in remembrance that the pancreatic juice 

 has the property of converting the fatty matters of the food into 

 an emulsion. The presence, then, of fat or oil in the feeces of the 

 dog, or of any other animal of which fat is an ingredient in its 

 food, points to some diseased condition of the pancreas. 



