A Cooperative Studif 
327 
cases does not appear iiitt'i-pretable. The following table gives the means for 
each class of mottling as specified in Plate VIII of the first memoir. 
TABLE XIII. 
Mottling and Size and Shape o f Egg. 
bb 
Index 
Breadth 
Length 
b 
69-52 
2-954 
4-256 
i 
70-60 
2-998 
4-255 
a 
70-68 
2-947 
4-170 
e 
71-71 
3-025 
4-228 
c 
71-86 
3-016 
4-200 
f 
71-90 
3-001 
4-184 
h 
72-12 
3-042 
4-220 
9 
72-65 
3-032 
4-184 
d 
73-08 
3-017 
4-133 
The series for index in ascending order corresponds njughly to a sei'ies in 
ascending order for breadth and descending order for length, but the system does 
not correspond to any easily appreciated mottling order. It appears as if the 
fieldworkers might have been influenced by shape of egg, instead of merely 
comparing the nature of the mottling in selecting type. At any rate in this 
section no final conclusions can be drawn, and it seems very desirable that more 
elaborate descriptions of mottling should in future be carried out. 
(ii) Ground Colony- and Breadth, Length and Index of Egg. 
The following scheme gives our results. The first value of ?; is the uncorrected 
the second the value when corrected for number of arrays and class index corre- 
lation, which is -9785 for brown and '9860 for green eggs. 
TABLE XIV. 
Index 
Breadth 
Length 
Brown 
Green 
Brown 
Green 
Brown 
Green 
-1747 
•1011 
I ^1432 
\ ± ^0322 
•1733 
•1313 
r -1160 
\ ± -0261 
•1348 
imaginaryt 
/ -1432 
[ ± -0322 
-1385 
-0773 
f -1160 
\ + -0261 
-2061 
-15.-30 
( -1432 
\ + -0322 
-1432 
-0857 
I -1160 
\ + -0261 
It will be fairly obvious from this table that there is no association of ground 
"•■ Mean value of j) supposing no association. 
t This signifies that if t;^'-^ be taken from -q"^ the difference is negative, i.e. i]' is less than the mean 
value of T] for zero association. 
