HATCHING. 



American trout eggs take very nearly, if not quite, 

 the same time, under similar conditions, to hatch out 

 as those of this country. Mr. Seth Green, no mean 

 authority, says that in water at 50 Fahr., the eggs will 

 hatch in fifty days, and every degree warmer or colder 

 makes five days difference, the eggs hatching earlier in 

 warmer, and being retarded in their development in 

 colder water. Mr. Green also says that if the eggs 

 hatch in fifty days, the yolk sac lasts thirty ; if hatched 

 in seventy days, the sac remains forty-five. We are 

 indebted to Mr. Stone for this information, which will 

 be found generally reliable, though subject to altera- 

 tion or modification by circumstances. 



By the kindness of Messrs. H. Ainsworth and 

 Livingston Stone, of the U.S. Fish Commission, here 

 follows a series of " times of hatching, etc.," which will 

 be found of equal value in this country : 



