OF THE SALMONIDM. 61 



most careful managemenb. Probably not 

 less than 80,000 ova will go out by the 

 Oheron ; and, as these have all been packed 

 by Mr. Youl's experienced hands, there is 

 the best possible prospect of their safe 

 arrival. Great expense is entailed as a 

 matter of course. In the first place, the 

 building of the ice-hoiise, the boxes, and 

 collection of the ova are no inconsiderable 

 items ; the ice will cost £100, and space for 

 the ice-house more than half as much more. 

 The cost will be borne by the New Zealand 

 Grovernment. None of the arrangements 

 differ in any essential particular from those 

 which had such a successful termination in 

 the case of the NorfolTc in January, 1864. 

 The conditions of weather, however, are 

 very different ; then the cold was so great 

 that it was difficult to prevent the ova from 

 freezing in the boxes ; now it has been so 

 warm as to raise a question whether they 

 will not have begun to undergo the organic 

 changes towards development which gene- 

 rally take place about three days after ferti- 

 lisation. If any considerable portion of the 



