OYSTER CULTURE IN ITALY. 



68l 



COMPOSITION OF SEA-WATER. 



(The figures show parts per thousand by weight. 

 Multiplied by 72 they would show grains per gallon. 

 Specific gravity 1027^-.) 



Traces of silver, lead, copper, &c., have been detected in sea-water. 



The industry of Messrs. Gasquet, consists in the 

 breeding and rearing of the following species : the oyster, 

 the common mussel and the red mussel, the " double praire" 

 (Venus verrucosaj, the " simple praire ' (Card it a side at a], 

 the "clovisse" of Toulon (Tapes decussata\ and the "clovisse" 

 of Cette (Tapes textiirata], the edible sea-urchin (Toxop- 

 neustes lividus], and the " violet' 1 '' (Ascidia cynthia). 



As we see, the industry which the Messrs. Gasquet, 

 are attempting to create has an economic bearing, for it 

 supplies a demand. The pares on the peninsula of Gien 

 are all surrounded by stakes driven into the bottom, and to 

 these hurdles are attached. This kind of enclosure serves 

 the double purpose of presenting an obstacle to the waves, 

 which beat on the coast, and of acting as a collector or 

 place of refuge for the spat of the shell-fish. Within the 

 pares have been placed other collectors, consisting of stones 



