il 
STUDY OF THE SFIGMAS. 181 
regular periphery like that of the Cobra-poison in Fig. 4. 
The periphery of that seen in Fig. 7 is irregular, but still so 
similar to certain disks in Fig. 2 in appearance, that the only’ 
apparent difference in the microscopical appearance of the two 
kinds of poison is the close grouping of small corpuscles seen 
in Fig. 12, which is wanting in all the others, and only seen 
under a power of 1080. 
The following, Figs. 13 and 14, are from Dr. 5S. Weir Mitch- 
ell’s “ Researches upon the Venom of the Rattlesnake.” 
Fig. 13. These crystals were obtained by diluting the venom 
and allowing the mixture to dry slowly, sheltered by a cover- 
Fic. 13. 
Crystals deposited frém the diluted venom of the C. conjluentus, by Prof. 
Hammond. 
glass. The crystals thus formed resemble those of ammoniaco- 
magnesian phosphate, which affect the feathery form of erys- 
tallization. 
The white deposit was composed chiefly of amorphous, 
