EFFECT OF VENOM ON MUSCULAR FIBRE. 1838 
ance under the microscope of a minutely granular mass, dotted 
with larger granules, as shown in Fig. 14.” 
Fie. 14. 
Appearance of muscular fibre after contact with venom. By S. Weir 
Mitchell, M.D. 
Structure of the Venom-Gland. 
The sfigma shown in Fig. 15 gives the microscopical ap- 
pearance of the structure of the venom-gland. 
The coeca lie in the centre, and the ducts are disposed on 
either side parallel to each other. 
Outside of the cellular layer, the poison-duct is made up 
principally of white fibrous tissue, with a small proportion of 
very fine fibres of yellow elastic tissue. The walls of the duct 
are provided throughout with an abundant supply of blood- 
vessels. Its communication with the fang and the mode of 
injection of the poison have been described on another page, 
and any one desirous of knowing all the details of a minute 
