48 THE VENOM OF HELODERMA. 



of the venom gland-ducts. If we collect venom in the manner usually em- 

 ployed in our work, we find the fluid collected from the mouth of the animal to 

 contain cells of an epithelial character and leucocytes. Many of these cells 

 contain granules, and through disintegration of cells nuclei get into the sur- 

 rounding fluid. In one case we saw only leucocytes in a drop which we col- 

 lected, and the fluid was here free from granules. The large majority of grau- 

 ules found in the venom collected from the mouth are probably not derived 

 from the venom gland, but from epithelial cells of the mouth and perhaps of 

 some neighboring glands. 



