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Blair Bell 



tected with dabs, while the previously shaven scalp was thoroughly purified 

 with iodine dissolved in chloroform or spirit. The animal was then entirely 

 covered with a sterilised sheet, in which there was a small aperture through 

 which the operation was conducted (tig. 3). The special sliding instrument 

 table attached to the operating-table (fig. 2) was also completely covered 

 with a sterilised cloth (fig. 3). 



A long incision, extending backwards from the root of the nose in the 

 mid-line over the vault of the skull as far as the occipital protuberance, 



Fig. 4. — View of a dog's head, showing the line of incision. (Photograph x i.) 



was carried downwards and laterally behind the ear on the side from 

 which the approach to the pituitary was to be made (fig. 4). This incision 

 was found to be better than the Y-shaped incision which was adopted by 

 Gushing and others, and which I, also, employed in the first few 

 operations. 



Next, the skin over the right temporal region was turned down and 

 the temporal muscle and pericranial fascia were carefully reflected from 

 the underlying temporal bone, which was removed widely with a trephine 

 and rongeur. The dura mater was opened with a triradiate incision, care 

 being taken to avoid the vessels. The muscle flap was then loosely 



