244 Thirty-fourth Annual Meeting. 
1901—Average water temperature 4914, gave a hatch of 55 
per cent. 
1902—Average water temperature 45 2-3, gave a hatch of 47 
per cent. 
1903 
per cent. 
1904—With an average water temperature of 47, gave a 
hatch of 48 per cent. 
1905—With an average water temperature of 48, gave a 
hatch of 56 per cent. 

Average water temperature 47, gave a hatch of 53 8-10 
It will be noticed that during the hatching seasons of 1903 
and 1904 the average water temperatures were the same, while 
there was a difference of 5 8-10 per cent in the hatch of cggs, 
and that while the season of 1901 had an average water tempera- 
ture of 1144 degrees higher than that of 1905, yet the hatch of 
1901 was one per cent less. 
We think that these facts can be accounted for in this way: 
During the incubation of 1903, the water temperature during the 
first three days ranged from 39 to 4014 degrees, from which time 
it steadily increased until the eggs were hatched, while during 
the incubation of 1904 at the receipt of the first eggs, the water 
temperature stood at 391, rose to 40 the next day and then 
dropped back to 39 and remained at that mark until the eleventh 
day of incubation. And during the season of 1901 the lowest 
water temperature was 41 degrees, while during the season of 
1905 the lowest water temperature was 42.degrees, remaining at 
that mark but one day, after which time there was an increase. 
Continuing the inquiry along these lines, we find that the 
Pike-perch eggs which were sent direct from the field to the 
Pennsylvania commission and were hatched at Erie, Pa., during 
the season of 1904 in water of an average temperature of 49 
degrees gave a hatch of 68 per cent, and during the season of 
1905 the water temperature at Erie stood at an average of 5) 
degrees, and the eggs shipped in the same manner as on the 
previous year resulted in a hatch of 80 per cent, while at Cape 
Vincent, N. Y., eggs sent from the same field and collected by 
the same spawners, and hatched in water with an average tem- 
perature of 43 degrees, yielded a hatch of but 20 per cent: also 
a record of 10,000,000 Pike-perch eggs sent direct from this 
‘S 
