41 3 WISCONSIN STATE AGRICULTURAL SOCIETY . 
convenience in handling, the eggs are placed upon wire-trays, 
fourteen inches wide by twenty-four inches long, and these trays 
are laid four deep in the hatching-troughs. The frames are so 
arranged that the water is evenly divided and flows evenly over 
the whole surface. The eggs are at present taken under unfavor¬ 
able circumstances. A fisherman’s small boat is hardly a place 
in which to perform the dainty process of impregnation ; and 
when, in addition to the want of room, the boat is standing some¬ 
times on one end and sometimes on the other, the men being 
frequently wet through to the skin, and the thermometer down 
among the thirties, it is a wonder that any eggs are impregnated. 
In the face of these difficulties, the impregnation last year was 
between sixty and seventy per cent. 
As it is about five weeks before the impregnation makes itself 
manifest, only the bad eggs which die can be removed before that 
time; and for the purposes of picking out the unimpregnated 
eggs and keeping the good eggs clean, the trays have been found 
very handy. They can be taken out of the water, cleaned with a 
watering pot, and set back in a clean trough without any injury 
to the eggs. Of those which are impregnated, scarcely one per 
cent, die after removal to the hatching-house. The period of 
hatching is about sixty-five days. The young fish, when first 
out of the shell, cannot swim, can just “ wiggle ” about and, loaded 
with the umbilical sack, hide in corners and under stone. In 
about forty days the sack is so nearly absorbed that they begin to 
swim and come to the top of the water for food. If they are to 
be used for stocking lakes, this is the period for transportation. 
They are taken before the sac is entirely absorbed, because then 
they require no food on the way and less change of water. They 
may be carried in tanks of any kind and emptied into the head¬ 
waters of the lake to be stocked. This should be done in the 
night, when their enemies are not feeding, and they will find 
hiding-places before morning. 
It does not look at present as if the white-fish could be made a 
pond-fish; at any rate the point is not determined. But I think 
the salmon-trout may be easily grown in ponds. The state of 
New York has no grounds suitable for trying such points. But 
Mr. Collins has been trying a series of experiments under my 
