.TRANSMISSION OF EGGS OF QUINNAT SALMON. 921 



their head out of the shell. When the head came first it was all right, 

 but if the sack biu-st through the little fellow seemed to have not power 

 enough to clear the shell. The first impression was the shell was hard- 

 ened somehow so they did not open far enough to admit an easy exit, 

 but afterwards I felt inclined to believe it was weakness of the fry caused 

 by the comparatively high temperature of the water, the weather being 

 very mild at the time. 



The eggs that came out later, when the temperature of the water had 

 gone down considerable, we had less trouble with, till it gradually left 

 off entirely. After all were out, the loss in fish became small, going 

 down to ten and less per day. By sharp watching many were saved 

 by helping them out of the shell when this burst. 



I had a. good deal hvmting round to find a suitable place to deposit the 

 fry. December 26, 1 fixed the place for the first lot of 10,000. January 4, 

 when 1 came with them, the river had only risen about 15 feet ; still the 

 place held good and the water was pretty clear; had gone down already 

 about 3 feet. 



The transport took place in tin cans of one-half meter diameter and 

 about one meter high. In the middle of the Slanting top is a large 

 round hole fitted with an inverted cover. The bottom of this cover and 

 the slanting top of the can are perforated with small holes. In the top 

 are fastened three tubes, 1 inch diameter, reaching about half way down 

 the can. In one of them, reaching down farther and by netting i)revent- 

 ing the fry of getting in, is a tin pump screwed in. Once in a while this 

 pump is applied ; the water runs in the middle cover and on the top of 

 the can, is prevented from running off by the sides of the can being run up 

 as high as the cover, and so the water runs through the little openings 

 back in the can, which is only filled half with water and is aerated in 

 this style. 



In the front of the can is, a little under half the height, a top-screw ; 

 this serves to change the temperature of the water in the can, if neces- 

 sary. The water out of the river is put on the top, where it leaks through, 

 while at the same time the water in the tin can runs off by taking the 

 screw out. 



The 10,000 fish were put in five cans at 6 a. m., and we had them in 

 the river in a shoal, gravelly place at 1 p. m., with the loss of not a 

 single oue. Temperature of the cans 4Jo, river 0° Celsius. January 

 11, 20,000 made the same trip in C cans under a sharp frost. The cans 

 were covered with straw and a basket and had hot-water stoves between 

 them in the cars ; and by transporting them to the river, temperature 

 l^o, river 1^° Cels. Had to chop a hole in the ice to get the fry in. 

 Loss, a dozen. January 18, about 20,000 went the same way, also in 6 

 cans; the weather thawing, no stoves used; river full of floating ice; 

 temperature cans and river alike, 1^°; loss a couple. Eiver gone down 

 considerable — about 5 feet. The place of deposit of these 50,000 was 

 in the river Maas, opposite the city of Yenlo, in Limburg, Netherlands, 



