374 



CETACEA. 



FIG. 413. SPERM WHALE. 



and filled with an oil that crystallizes as it cools into the substance well known 

 in commerce by the name of " spermaceti." The cavities in which the sper- 



FIG. 414. WHALE FISHERY. 



maceti is lodged have nothing to do with the real skull, which is rather small, 

 placed beneath them, and contains the brain in the usual manner. From the 

 head of a single cachalot are obtained from eighteen to twenty barrels of fluid 



