APPENDIX. 197 



Establishment in the world, where the Ova are 

 received without having passed through any of the 

 perils and disasters to which these had been 

 exposed. 



It will have been observed that, while only about 

 8000 fish were produced from the importation of 

 Ova in 1864, more than double that number have 

 been hatched from about the same number of Ova 

 received on the last occasion, although fourteen 

 days longer on shipboard. 



This discrepancy in the results of the two under- 

 takings, and the great success of the last, are 

 probably in a great measure due to the lighter 

 packing of the moss in which the Ova were em- 

 bedded, and to some improvements in the Ice- 

 house ; to both of which Mr. Youl was led by his 

 previous experience. 



A portion of this higher success is also to be 

 a,ttributed to some alterations in the hatching 

 boxes at the Ponds, consisting chiefly of the 

 substitution of a finer for a coarser gravel, by 

 which the Ova were prevented from ever sinking 

 out of view, enabling Mr. Eamsbottom at once to 

 remove all that died, and become a source of 

 danger to the living during the process of 

 hatching. 



The temperature of the water also, which was 

 several degrees lower in the month of May last than 



