188 Symmetry of Egg and Symmetry of Embryo in the Frog 
(8) The Sperm-path and the First Furrow. 
As explained above the Sperm-path (outer or " penetration " path) may be 
parallel to the First Furrow when it is not actually included in the latter, or when 
it makes an angle with the Furrow it may be turned towards or away from it. 
In Table XXXVII. will be found the distribution of this angle in all cases, and 
in each of these three variations of position, both when the eggs are affected by 
gravity and pressure (I.) and when they are not (II.)- 
TABLE XXXVII. 
Sperm-path and First Farrow. 
I. 
Eggs close. Axes horizontal. 
11. 
Eggs spaced. 
Axes vertical. 
Angle 
rt. All cases 
b. Towards 
fiinow 
c. Away from 
furrow 
In or 
parallel 
to furrow 
a. All cases 
b. Towards 
furrow 
c. Away from 
furrow 
In or 
parallel 
to furrow 
- 90—75 
75—60 
60—45 
45—30 
30-15 
15—0 
+ 0—15 
15—30 
30—45 
45—60 
60—75 
75—90 
0 
1 
0 
4 
11 
42 
41 
8 
9 
6 
1 
0 
0 
1 
0 
4 
9 
11 
11 
4 
7 
1 
0 
0 
0 
0 
0 
2 
9 
9 
4 
2 
1 
0 
0 
0 
0 
2 
0 
5 
26 
17 
3 
1 
0 
1 
0 
0 
0 
2 
0 
2 
7 
1 
0 
1 
0 
1 
0 
0 
0 
0 
0 
3 
13 
11 
3 
0 
0 
0 
0 
Totals 
123 
53 
27 
43 
55 
14 
30 
11 
M 
3-47° ±1-31 
4-85° ±2-69 
6-35° ±2-29 
-2-04° ±1-63 
6-44° ±5-20 
0-62° ±1-49 
a 
21 ■47° ±0 -.93 
29-08° ±1-90 
17-66° ±1-62 
17-94° ±1-15 
28-89° ±3-68 
12-09° ±105 
It will be seen that the tendency of the Sperm-path to lie in or parallel to the 
First Furrow is great, and greater when the external disturbiog influences are 
removed, ct- = 17-94<° + 1-15 as opposed to cr = 21-47° + 0-93, when gravity and 
pressure act upon the egg. It will be noticed however that in any case the value 
of the standard deviation is less for this angle than for that between Sperm- 
entrance Meridian and First Furrow (Table XXXII.). This is due to the fact that 
while the angle between Sperm -path and First Furrow cannot be greater than that 
between Sperm-entrance Meridian and First Furrow, it may, of course, be less. 
Also the path may be parallel to the Furrow when the Entrance Meridian makes 
a considerable angle with it (Table XL.). 
