202 Mr Heape, Note on the influence of extraneous forces 
Regarding the unfertilised or addled eggs, N suffered a much 
greater proportion of loss than G. 
The difference between the proportion of cocks and hens 
produced in JSTs total results and in the results obtained from 
those of his nests in which all the eggs laid were hatched, is 7 ’62 
in favour of the latter, and it may therefore be inferred that his 
losses include more cocks than hens. 
G’s accurate results, on the other hand, show a decrease of 
84 07 cocks per 100 hens when compared with his total results, it 
may therefore be inferred that he loses more hens than cocks. 
At the same time, when the detailed results of both breeders 
are compared, there is no room for doubt that the losses each 
experience are not responsible for the wide difference between their 
results, and it is clear that some influence is at work which 
profoundly affects the proportion of the sexes produced in these 
two aviaries. 
Details are given in the following Table. 
Year 
Breeding 
Produce 
Cocks 
per 
100 
hens 
.breeders 
Cocks 
CO 
£ 
O) 
M 
Nests 
Eggs 
laid 
Cocks 
Hens 
Total 
'N 
1888 
2 
2 
5 
23 
5 
7 
12 
71-43 
1889 
3 
5 
14 
57 
14 
23 
37 
60-87 
1890 
4 
5 
13 
61 
23 
25 
48 
92-0 
o 
0 
1891 
5 
6 
14 
64 
15 
25 
40 
60-0 
O 
1892 
4 
5 
14 
58 
12 
21 
33 
57-14 
u 
Pm - 
1893 
3 
4 
11 
50 
18 
12 
30 
150-0 
cS 
O 
EH 
Totals 
11 
22 
71 
313 
87 
113 
200 
76-99 
1892 
4 
8 
20 
84 
53 
15 
68 
353-3 
rG 
o 
(N 
1888 
1 
1 
1 
4 
1 
3 
4 
33-3 
^ <d 
1889 
2 
2 
2 
8 
4 
4 
8 
100-0 
1890 
3 
4 
6 
28 
14 
14 
28 
100-0 
1891 
1 
1 
1 
5 
2 
3 
5 
66-6 
GO 05 
® 2 
eg 
© ti 
1892 
1 
1 
1 
3 
1 
2 
3 
500 
Totals 
4 
9 
11 
48 
22 
26 
48 
84-61 
<D 
rb CD 
E3 ^ 
o e 
Sh 
1892 
4 
6 
11 
48 
35 
13 
48 
269-23 
PM 
°/o Of 
eggs 
not 
hatched 
47-83 
35- 09 
21-31 
37-5 
43-1 
400 
36- 1 
1905 
