2^6 



POPULAR SCIENCE MONTHLY. 



(4) being killed by sudden changes in the temperature and density 

 of the water. Artificial fertilization and the rearing of the em- 

 bryos in the laboratory largely eliminate these dangers. We have 

 adopted other methods to insure success. A few of the oysters 

 were removed from the Government plant and deposited two miles 

 farther up the bay, nine miles and a half from the ocean, where 

 it was thoua'lit the water was warmer, less salt, and loss variable 



Eahtkt;.v Oystkus in Okkgdn. The lowt-r mw shows sizL' wiien iihuited in 1891) ; tlie 

 u))I)fr row represents their apiieanuice in isys. 



than on Oysterville Flat. Sonic, during the breeding season, were 

 ])laced on spawning iloats and anchored near the shore, where the 

 shallow water is thoii •uglily warmed by the sun. It was in one of 

 these floats that the oysternien had an o])i)ortunity to see the oysters 

 spawn " spontaneous," for the water therein, reaching 70° F., be- 

 came milk-white with spawn or milt within an hour after the 

 oysters had been taken from the plant. This was really our first 

 proof that the introduced oyster would spawn here. Some were 



