TREPANNING. 



191 



Transfusion. — This means tlie transfusion of blood 

 from one living animal to another. Mr. James Farrel, 

 of Dublin, Ireland, has been the first veterinarian I am 

 aware of who have employed transfusion to any extent, 

 and to excellent advantage. In cases of debility from 

 blood letting, he has done wonders with it, and have 

 proved to his countrymen the danger of bleeding horses 

 to cure or prevent diseases. For in the cases which had 

 not been bled he had no trouble with them ; but in those 

 which had been bled before he had been called to them, 

 every one of them died. Hence he had resource to 

 transfusion, in order to save others treated by bleed- 

 ing. The efiect of transfusion is instantaneous, almost. 



Tread. — (See Foot Diseases.) 



Trepaning. — This is an operation for opening into 

 the bones of the head or face, for elevating or raising a 

 portion of bone, which from accident has been depressed, 

 or fractured. The instrument is called a Trephine, and 



Trephine. 



is represented in the accompanying drawing. This in- 

 strument is used to cut out a circular portion of the bone, 

 so that a smooth piece of iron is inserted in the hole, and 



