APPENDIX. 93 



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 about three inches deep in 

 another basket, and also in a copper wire bag; two or 

 three inches of gravel were laid over the bottom of each, 

 and both basket and bag laid in the pool covered by four 

 inches of water. The ova of a female and milt of a male 

 were then successively squeezed from two fish on both the 

 basket and bag, and spread over it regularly with the hand, 

 one after the other, and after leaving them in this state 

 exposed to the water for a few minutes, the whole was 

 covered with two or three inches of gravel, and left in the 

 pool. These four pair of fish afterwards emitted volun- 

 tarily a small 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 which had partially spawned in the river 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 February, examined 

 the ova, and life was plainly observed in the baskets, wire 

 bags, and unprotected gravel ; both were placed artificially, 

 and were deposited by the salmon themselves. 



<tf 19th March. The fry had increased in size, and went 

 on gradually increasing, much in proportion to the tem- 

 perature of the water. 



" 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 April. The baskets and bags were all opened; 

 the sacs had become detached from their throats. The fry 

 measured about three quarters of an inch in length, and 

 they swam about easily,' all marked distinctly as f par/ 

 The baskets recommended by Professor Agassiz proved 

 superior to the wire bags of Mr. Shaw. In the latter, 

 only about twenty per cent, came to maturity, whilst in 

 the former not above ten per cent, proved barren, and in 

 the baskets used the 5th of December, not five per cent. 

 proved barren. It is impossible to say exactly the pro- 



