THE NAPOLEON FISH-HATCHER. 403 



in streams to hatch the fecundated ova by Lieut. Jacobi or 

 Joseph Remy. Messrs. Furman and Ainsworth being both 

 gentlemen of leisure, who devote their time to fish-culture 

 pro bono publico and for their love of the subject, much ben- 

 efit may therefore be reasonably expected from their experi- 

 ments in water-farming. 

 



" GENERAL DIRECTIONS," BY SETH GREEN. 



For the general management in propagating salmon and 

 trout, and the transportation of fecundated ova and the ale- 

 vins, the following advice, founded upon successful experi- 

 ment and entirely reliable, may be read with interest by 

 those who are about to commence fish-culture by artificial 

 assistance : 



" Build your ponds according to the amount of water you 

 have. If you have but little, build small. The water should 

 be changed every 24 or 48 hours, and the oftener it changes 

 the better. The trout can be very plenty if they have suffi- 

 cient fresh water and food. 



" I can send ova a fifty days' journey packed in a box with 

 moss. I place the moss in a tin pail, filled with sawdust, so 

 that the spawn will not feel the changes of heat and cold. 



"Directions for handling the Spawn. Pick the moss care- 

 fully oif from the top of the spawn. Then put the box in a 

 pan of water and turn it nearly bottom-side up, and pick the 

 moss out very carefully. The spawn will sink to the bottom, 

 and you can pick the moss out of the pan. If there is a little 

 left it will do no harm. Then pour the spawn in your hatch- 

 ing-trough by holding the edge of your pan under water, and 

 4 place' them, without touching the spawn, by agitating the 

 water with the bearded end of a feather. The dead spawn 

 will turn a milk-white color, and should be picked out. Your 

 trough should be so arranged that the water will run in it 

 about twelve feet per minute. The water should be filtered 

 by running through gravel or cloth screens, to prevent the 

 sediment from reaching the spawn. I run about one inch of 



