288 On the tntrodnction of 



duced from, a tube with a regulating stop-cock^ was made to 

 percolate unintermittingly through the whole series = M. 

 Costers contrivance seems particularly well adapted for the 

 narrow space and the limited amount of fresh water which 

 can he afforded on board ship. "Were one such tub containing 

 the ova enclosed within another, so much larger as to 

 admit of an interspace filled with water, the temperature of 

 which could, by means of ice surrounding the cistern whence 

 it issued, be preserved at a point near to that of the water 

 employed in Stormontfield breeding troughs, say about 38°, 

 and the ova continuously supplied with water from the same 

 source, an equable temperature might be maintained within 

 and around the spawn tub, so low as to give every reason- 

 able assurance that the ova would not be hatched within 

 the time occupied on an ordinary passage from Europe to 

 the Colony. The tubes employed, it need scarcely be observed, 

 ought to be of flexible material, and the boxes or tubs con- 

 taining spawn or young fish shoidd be so placed and secured 

 as to obviate violent shocks, and to have a command of good 

 air. In the case of young fry it would still be essential to 

 keep up a run of fresh water through the tanks holding 

 them, but the low temperature might be dispensed with. 

 S molts of two years of age, as already observed, would, 

 piobably, live out the voyage in tanks of sea water, if aided 

 by subsidies of food thrown in to them. 



15. In anticipation of young Salmon fry being delivered 

 here alive, it would be expedient and most desirable to have 

 pens and ponds prepared for their reception near the margin 

 of a perennial stream or rill of pure water, to be diverted at 

 will into or away from them, as might be required. 



16. Similar ponds, connected with an ever-flowing rill of 

 good water, would be absolutely essential for the reception 

 of ova, should such be delivered here unhatched, though 

 still in a living and healthy condition. The character of 

 the streamlet and of the brook or river into which it falls 

 should correspond as nearly as possible with the aflluents of 

 the Salmon rivers at home, up the tributaries of which the 

 pregnant fish are known to force themselves, in order to 

 deposit their spawn in the beds of shingle and gravel 

 prevailing there. 



