Introduction of Salmon and Trout, &c. 289 
in the cooler latitudes to the original quantity of twenty- 
Your gallons per diem. 
Mr. Boccius, the gentleman entrusted by the Government 
at home to procure the spawn, and make arrangements for 
its shipment and care during the passage, had fixed the 
15th and 20th of April as the periods at which the ova of 
the trout and salmon would respectively be hatched. But 
it appears from the report of the Captain and passengers, 
that the change took place so early as the 1st of March, 
when they were in latitude 14°* 30°’ north, longitude 26°° 00 
west. They say that from that day forward, for above a 
fortnight, they observed two descriptions of fry attached to 
stones, gravel, and the sides of the tub, apparently in a half 
torpid state, which they then lost sight of, from the water 
becoming thick and putrid; ihe weather at this time being 
intensely hot, with nearly a vertical sun. 
As the ship approached the colder latitudes, the water 
gradually cleared, but no symptoms of life appeared in the 
spawn tub; and when the vessel arrived here, Dr. Milligan 
and I carefully examined first the water in the tub, and 
then the gravel, but without finding any traces of either 
spawn or fish. 
The water, I may observe, was impregnated with a con- 
siderable quantity of rust, which, as the tub was of wood, 
must have originated in the iron tanks in which the supply 
for the fish was contained. 
These tanks were coated with a description of varnish, 
which Mr. Boccius supposed would have prevented rust; 
but, from some cause or other, it did not answer this 
purpose. 
Now as to what appears to me to have been defective in 
the plan adopted :— 
First. —The spawn which was taken,—the Salmon on the 
AA 
