THE NEW AKT OF BREEDING FISH. 21 



He has also remarked that except in a runnmg 

 streanij other fish than carp and tench become bar- 

 ren. 



When fish are caught for the purpose of taking 

 from them the eggs and are found to be in an unfit 

 state to be operated upon, from not having gone their 

 full time, they should be kept in a reservoir till the 

 proper time, and then relieved of their eggs and set 

 at hberty again. Otherwise they will die in the res- 

 ervoir ; as they will not while in that manner kept 

 prisoners spawn naturally, but will retain their eggs 

 and perish. 



When eggs are preserved in water, it must be 

 frequently renewed or aquatic plants be placed in it. 

 These plants preserve the eggs in unchanged condi- 

 tion. 



We have -weighed one hundred unfecundated eggs 

 of small trout, after having preserved them in water 

 for two days, and dried them on linen for five minutes, 

 and found their weight to be four gram. Twenty- 

 six eggs placed in a straight line made one hundred 

 millimetres, which gives a diameter of a little less than 

 four miUimetres for each egg. 



RESULTS WHICH MAY BE HOPED FROM THE DISCOV- 

 ERIES OF GEHIN AND REMY. 



Man reigns on the earth supreme : he bends the 

 sun to his use for the plants he requires ; domestic 



