543 
If in the cases 6 and 7 we have t= --- 6, or y=, we find 
for the point of intersection A: v’=1 or wu’ = 0, hence y= 1-or 
u=0. This point therefore coincides with the point of inflexion of 
the erroneous curve. This point of inflexion corresponding to v= 1 
U — Lo ot Fn 
En MOP rare it is conjugate to the point of inflexion 
of the original curve traced on ordinary squared paper. 
or 
6a. (a. 
== —6.> 0 or p= 0 t= —o< 0, or B=y >.0 
(fig. 3a) (fig. 36) 
(uz) 
(i 2.) 
/ 
Fic. 3a. GEEN Ee sb. 
From (4) we find for the reaction-function 
5 1 _ da Aa — x + (&@ + En) #0 En 
PE ea ae IM (Ere) 
the reaction consists of a (positive or negative) constant, of a ‘probably 
positive) term proportional to x and of a negative term proportional to 2”. 
Example: - . 
Length of oat-stalks (data procured by Dr. E. Ginray, Wageningen). 
Unit of z: 1 em.; class-range —1 unit —1 cm. 
The following table contains the observed values of v with the 
corresponding numbers Y of individuals (YY = NV = 1008); more- 
over the values of z appertaining to the class-limits are given. 
In the figure on ordinary squared paper the frequency-curve is 
== ec Pr? + Qu + R. 
1 
represented by x—x—x, the normal function by —, the reaction- 
curve by ----. 
The figure on logarithmic paper contains the line 2 = A (UA) = 
= 3336 (u — log 1,318) = 3,36 u — 0,403. 
Since «,—« (see p. 536) has an uncommonly small value, the 
formula (9a) is not suitable for the computation of «. Therefore we 
started by estimating «, —0 and «#, = 2§= 2 47,5 = 95, which 
