134 UTILIZATION OP MINUTE LIFE. 



crab, and light himself to bed with the oil. It 

 would be interesting to examine this oil, and ascer- 

 tain the quantity that could be produced annually 

 by a given number of these crabs. 



***** 



The Crustacea of which we have spoken, and 

 whose study we now relinquish, are all oviparous, 

 and have separate sexes ; therefore artificial breeding 

 and cultivation of any of their species would pro- 

 bably be attended with success. The artificial 

 breeding of crawfish and lobsters appears to have 

 begun in France ; M. Coste of Paris, and M. Gaillon 

 of Concarneau, have lately concentrated their atten- 

 tion upon the artificial propagation of these and 

 some other useful animals upon the French coasts. 



