of Salmon and other Fish artificially. 167 



posed persons, and on examining the pool, only a small quan- 

 tity of ova appeared to have been deposited. On the 23rd of 

 November four pair of salmon were again caught and placed 

 in the pool, which vrere observed to commence spawning on 

 the da}^ following ; — caught them carefully, — squeezed gently 

 about 1200 ova from a female into a basin of water, and then 

 pressed about an equal quantity of milt from a male fish over 

 them ; stirred the two about gently, but well together, with 

 the fingers, and after allowing them rest for an hour, the whole 

 was deposited and spread in one of the wicker baskets re- 

 commended by Professor Agassiz, having about 4 inches of 

 gravel below them and 2 or 3 inches of gravel above. A si- 

 milar quantity of ova, treated in the same way, was also de- 

 posited in one of the copper wire bags, as used by Mr. Shaw, 

 and both were then immediately placed under water in the 

 pool ; a little of the ova was buried in the open gravel at about 

 3 inches in depth. In another basket, and also in another 

 copper wire bag, 2 or 3 inches of gravel were placed over the 

 bottom of each, and both basket and bag laid in the pool, 

 covered with about 4 inches of water. The ova of a female 

 and milt of a male were then successively squeezed from two 

 fish on the gravel in both basket and bag, and spread over it 

 regularly with the hand one after the other ; and after leaving 

 them exposed, in this state, to the water for a few minutes, 

 the whole was covered with 2 or 3 inches of gravel and left in 

 the pool. These four pair of fish afterwards emitted volun- 

 tarily a sm.all quantity of spawn which had been left with 

 them, and on the 1st of December they were all turned out 

 into the river. On the 3rd of December, caught three pair of 

 salmon which had already partially spawned in the Ewe; — used 

 another basket and also another wire bag, treating the spawn 

 in the same manner as last described ; these fish were then 

 also allowed to deposit voluntarily the little spawn of which 

 they had not been deprived, and afterwards turned out into 

 the river. On the 19th of Februaiy examined the ova, and 

 life was plainly observed in the baskets, wire bags, and unpro- 

 tected gravel, both where placed artificially and where depo- 

 sited by the salmon themselves. 



19th of March, the fry had increased in size and went on 

 gradually increasing, much in proportion to the temperature 

 of the weather. 



22nd, the eyes were easily visible, and a few of the ova had 

 burst, the young fry having a small, watery, bladder-like sac 

 attached to the throat. 



18th of April, the baskets and bags were all opened ; the 

 sacs had become detached from their throats, the fry measured 



