290 Introduction of Salmon and Trout 
9th, the Trout on the 26th of January, and which, in conse- 
quence probably of the excessive heat, came to life forty-six 
days before the time reckoned upon by Mr. Boccius, should, 
I think, be shipped at least six weeks earlier, and thus insure a 
colder climate for the breeding out; for Mr. Boccius, under 
whose able directions the experiment has been made, does 
not seem to have given sufficient value to the effect of the 
artificial heat to which the spawn would be exposed in the 
hold of a ship. 
Second.—It appears to me that the tub would have been 
better placed on deck than under;the fore-hatchway, where 
the heat at all times, especially in the tropics, must have 
been very much greater: such arrangements might easily 
have been made as to have secured for the spawn tub on 
deck a considerable current of air, with ample protection 
from the sun and from salt water in bad weather. 
Third.—The quantity of spawn, I think, was also far too. 
great for the size of the tub in which it was placed; for, 
had it all come to life, the fry could not possibly have found 
space sufficient to exist in, and had a portion only bred out, 
as appears to have been the case in the present instance, 
provision should have been made for their removal into a 
separate tub of fresh water, so as to prevent the decomposed 
matter of the dead spawn and young fish from proving 
injurious to the living fry. 
Fourth—Had the fry arrived, it is a matter of con- 
siderable doubt in my mind whether the rivers at this 
season of the year (June), would have been in a proper 
state to receive them ; because. swollen as they are, the fish 
would in their delicate state have had to contend against 
too great a current or fresh ; which, however, would not be 
the case were the spawn shipped, as I propose, in the early 
part of December. ‘The fry would then, in all probability, 
