SEA-FISHERIES LABORATORY. 2953 
moments, but instead of the negative values of the 
months November, January, etc., zero values have been 
substituted. I am uncertain whether or not this is the 
correct practice. The statistical constants obtained in 
this way are as follows* (the values in column (4) have 
been multiplied by 1,000) :— 
d = 0°6967826 
lis= 4666915 
ws= 0°436612 
jug= 54:9096 
Bi= 0°001875 
By= 2.52109 
k = —0°0014 
m= 3°764225 
a= 7009664 
ee ee he ) eg 4s 
agers tT ¢m +1) }? 
The mean = mode = origin is at 7696782. 
The curve is Pearson’s Type II, or 
and is symmetrical and limited in both directions (the 
start and finish being —a and +a). 
The figures in column (5) have been obtained by 
calculating ordinates from the above constants. The 
latter, or the latter two figures, have, of course, only 
an arithmetical significance. | 
Column (6) represents the values of column (3) 
smoothed, or graduated by the application of Pearson’s 
method of calculating a most probable frequency curve 
* The notation is that of Palin Elderston’s “‘ Frequency Curves and 
Correlation.”’ 
