242 A Bioiibetrical Studij of Conjugatiori in Paramecium 
Series A. 
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1475 152.5 157.5 162.5 167.5 172.5 177.5 182.5 167.5 192.5 197.5 202.5 207.5 212.5 217.5 222.5 227.5 232.5 
Diagram III. Eegiession of breadth on length for the non-conjugants of Series A. 
Considering the relative smallness of our total numbers, a straight line gives 
a very good fit to the means of the arrays. 
Returning to Table VIII., we see that in both Series A and C the conjugants 
have length and breadth much less highly correlated than have the non-conjugants. 
The lovs^ering of the correlation I believe to be due principally to the change 
in shape which results from the union of the individuals in the conjugation 
process. Also, the element of difficulty in measuring the breadth of conjugants 
(cf. su-pra, p. 222) would operate to lower the length-breadth correlations. 
The increase in the value of the length-breadth correlations for the non-con- 
jugants as we pass from Series A to Series E is also to be noted. This again 
marks the change in the variation constants accompanying the change in environ- 
mental conditions in the culture. 
We may turn now to the index correlations. For Series A, C and E there 
have been determined the correlation of the length-breadth index with length 
