J. W. Jenkinson 
189 
Further, when the path is turned away from the Furrow the standard deviation 
diminishes, when it is turned towards the Furrow its value increases. It is in the 
former cases that the inner or " copulation " path is generally seen, parallel to the 
Furrow, but inclined to the " penetration " path (Fig. 5 C). 
It might be supposed that when the Sperm-path is turned away from the 
Furrow, the relations between Sperm-entrance and Sperm-sphere Meridian, on the 
one hand, and Plane of Symmetry and First Furrow on the other would be less 
close than when it is turned towards it. This however (to accept the standard 
deviation as a criterion) is not the case, as may be gathered at once from Tables 
XXXVIII. and XXXIX. Whether the eggs are close and under the influence of 
gravity, or not, the standard deviation, in the case of each of the angles considered, 
except that between the Sperm-sphere Meridian and the Plane of Symmetry, 
is considerably less in the former than in the latter contingency. The numbers of 
course are very small, but all the results point in the same direction. 
When the path is parallel to or in the Furrow (Table XL.) the angles made by 
Sperm-sphere and Sperm-entrance Meridians with the Furrow are of course nil. 
The standard deviations of the other two are greater than when the path turns 
away from the First Furrow when the eggs are under the influence of gravity 
and pressure, about the same when they are not. 
Nevertheless I am bound to point out that if the relation between Sperm- 
entrance and Symmetry Plane and First Furrow be measured by the correlation 
coefficient, instead of by the standard deviation (the results are given in Tables 
XLI. and XLII.), it is closer in those eggs in which the Sperm-path is turned 
towards the Furrow than it is in the whole series. 
This may be readily seen from the values of p in Table XXXIII., first and 
second columns. Yet the corresponding standard deviations (Table XXXIL, 
second and third columns, first and third rows) are also greater, instead of less, 
when the path is inclined towards the Furrow than in the whole series. This shows 
plainly enough the difficulty of interpreting results based on such small numbers. 
(9) Sperm-path and Plane of Symmetry. 
At present we have discovered no close correlation between the Plane of 
Symmetry and any one point of the Sperm-path. There is however a correlation— 
if calculations based on such small numbers can be trusted — between the angle 
made by the Sperm-path with the First Furrow and the deviation of the latter 
from the Plane of Symmetry, at least when the eggs are not subjected to the 
influence of gravity and pressure. 
When the eggs are close and their axes horizontal there is no correlation 
(Table XLIII. a). 
