OF THE 8ALM0NIDJE. 39 



packing of the ova, the form of the ice- 

 house, and all details of treatment were 

 similar to those which had proved so suc- 

 cessful in the Norfolh, but some of the cir- 

 cumstances were more favourable. Nearly 

 two-thirds of the thirty tons of ice re- 

 mained, the temperature of the ponds was 

 lower, and experience had suggested many 

 little improvements during the hatching; 

 and though these eggs had been a hundred 

 and four days in the ice, 6000 young 

 salmon and 900 salmon- trout were raised 

 from the 30,000 living ova transferred to 

 the ponds — a percentage which must be 

 regarded as very satisfactory. 



With the object of testing the question 

 whether any migratory species of Salmo 

 will breed in confinement, a number of 

 these salmon-trout fry were put into a 

 specially constructed pond, fed by a small 

 rill of bright cool water, where they were 

 disturbed as httle as possible. By the 

 middle of October, 1867, many of these 

 prisoners had put on the smolt dress, and, 

 no doubt feehng the migratory impulse, 



