144. 
this was repeated until the 28th, when they were removed to 
tray No. 9. All died unhatched except one on the 27th, which 
died while hatching, and one hatched out on the 28th. 
The foregoing would seem to show that should a strong and 
rapid flow of water be present, injury from the paraffin need 
scarcely be anticipated to be immediately fatal to the embryos 
in the egg; but it does not tend to prove that the young will 
hatch, or if they do that the alevins will be strong or 
healthy, 
Although it has been abundantly proved that the eggs of 
Salmonide may be suffocated by the presence of mud or other 
such substances in the water used for their incubation, still we 
have the fact that we see numerous trout in peaty burns, some- 
times, it is true, small and dwarfed, but at other times even of 
good size. Certain circumstances induced me to try what 
would be the effect of a peaty solution on the eggs. I had 
some peat from the vicinity of Earls Burn, a few miles from 
Howietoun, and on December 15th, 1885, placed 74 Ibs. of this 
moist peat or turf in an upper reservoir (23 inches long, 184 
wide, and 13 deep,) and then added 18 gallons of water from 
the pump. The water from this reservoir, or tub, passed 
through a tap into two trays (22 inches each in length) which 
were placed in a stair-like sequence below it, having perforated 
zine screens in both about half-an-inch above the floor of each, 
and over which the water ran, the outlet from these trays dis- 
charged itself into two smaller ones situated below them, each 
of which had 115 trout eggs placed in them. In one, No. 6, 
the tray containing the eggs was simply charred inside, while 
the other, No. 5, had in addition a screen of perforated zinc 
resting on a ledge, so that it was raised half-an-inch above the 
floor of the tray, and permitting water to go under as well as 
over the eggs. 
Experiment No. 6, or of 115 eggs in tray No. 5, placed 
there December 15th; it will be sufficient to record that it 
became necessary every few days to wash off the accumulated 
peaty sediment from the eggs, and that more frequently than in 
tray 6. Deaths—4 in December, and 3 in January, and 1 in 
