SEA-FISHERIES LABORATORY. 131 
for each 10-daily period in degrees Centigrade. Making these 
calculations we find :— 
Temperature-integral for 1907-1916, Mar. to Sept. = 236-3 
Temperature-integral for 1914, Mar. to Sept. = 266-2 
Temperature-integral for 1916, Mar. to Sept. = 243-9 
-Considering these results we see at once that the differences in 
time of spawning and percentage of fat between 1914 and 1916 
are to be correlated with the integrative temperature factor. 
Spawning occurred relatively early (in August) in 1914 because 
of the relatively great cumulative heat effect, and relatively 
late in 1916 for the opposite reason. 
