149 
immersed in water for a month), and placed it in the hatchery. 
A blacksmith made an iron rod 344 inches long, and half an 
inch in diameter, having-a ring at the top for the purpose of 
securely fixing it. At every six inches, (commencing at 3 
inches from the bottom) were cross bars projecting three inches 
on either side, and slightly curved at their outer ends. Three 
small trays of perforated zinc were then secured by means of 
silver wire to the cross bars, the superior being about two 
inches below the surface of the water; the succeeding one 14 
inches, and the lowest 26 inches. The rod and zinc were 
painted with Brunswick black. The water was changed daily 
until February 22nd, or about 70 days, when the eggs were 
transferred to the hatching trays, for as they had been taken 
three days prior to the experiments being commenced they had 
been a sufficient time under the new conditions. 
Experiment No. 15.—Two inches under water the first egg 
hatched March 24th, 2 on the 25th, 2 on the 26th, 1 died, and 
1 remained. 
Exrrrment No. 16.—Fourteen inches under water, the first 
hatched March 23rd, 1 on the 24th, the two others died. 
Experiment No. 17.—T'wenty-six inches under water, 1 
hatched March 24th, 3 on the 25th, 1 on the 26th, 1 died, 1 
remained. 
The foregoing, so far as they go, are conclusive that in 
almost still water, or merely changed once a day, trout eggs 
may be successfully incubated at at least 26 inches in depth. 
It would be, however, worth while to investigate the results 
obtainable at still greater depths (which I have not the facilities 
for doing), and also trying the various currents of water and 
quantities supplied every 24 hours before being quite confident 
that the disturbance of the redds and carrying of the eggs into 
deeper and stiller water is not necessarily fatal to the embryo. 
In 1883, I gave the result of some experiments which I had 
made of submitting the eggs of the Salmonide to the influence 
of sea water, and it may not be amiss to point out that the 
appearance of such as die in a saline infusion is very different 
from what is seen should they do so in fresh water. Unim- 
