Raymond Pearl 
65 
Series B, Length on breadth. 
9-54,44 
b,=. X •6168 = 1-3355. 
1"1 / 01 
Series B, Breadth on length. 
, 1-1751 ^^^^ 
From these values we easily obtain the following characteristic equations, 
in which L signifies "length of body" in mikrons, and B "breadth of body" in 
mikrons. 
(Probable L = 1-7024 B + 6-418 
Series A 
Series B 
(Probable 5= -2742 Z + 3-295 
[Probable L = 1-3355 B+ 10-219 
(Probable 5= •2849X4- 3-787 
The means of the arrays and the fitted regression lines are shown in Figures 
4 and 5. 
16 
80 90 100 H-0 
Breadth in mikrojis. 
Fig. 4. Eegression lines for Series A (Unfavourable cojiditions). • • =Eegression of length 
ou breadth, o o = Eegression of breadth on length. 
It is evident that the regressions are very closely linear. This result is in 
accord with what has been found for the other Protozoa for which this point has 
been determined, namely Arcella (Pearl and Dunbar, 1903) and Paramecium (Pearl, 
Biometrika v 9 
