Mr Heape, Notes on the Proportion of the Sexes in Dogs. 137 
among small dogs. But this is not so; the details given below, 
of Schedule returns, show a similar relation between size and 
fertility. The figures there given are not identical with those we 
are now considering but the difference, on the whole, is not an 
increase in the pups per litter of small breeds, it is a decrease in 
the case of large breeds ; a difference which may be accounted for 
to some extent b} r the very much smaller numbers there dealt 
with (individual variation), but probably chiefly to the fact that 
the bulk of the Schedule returns deal with animals which are 
especially finely bred. 
From a comparison of the whole of my figures I am tempted 
to suggest that, if dealt with in greater numbers, returns of all 
breeds of dogs would show the rate of fertility coincident with 
the degree of specialisation from the parent type. 
It is possible there is correlation between the size of the 
mother and the total bulk of the young born, it is also possible 
that large dogs do not produce young so often as the smaller 
breeds and that therefore the latter may well produce fewer at 
each gestation. On these points I have no conclusive evidence, 
all that can be asserted is that there is a definite relation between 
the size of different breeds of dogs and the average number of 
pups produced per litter. 
Besides the above breeds there are a considerable number of 
others, the pups of which are from time to time recorded, some 
of these are large, some small dogs. These I have added to the 
records of special breeds and have collected the totals for each 
of the three years 1889 — 1891 (Table V) in order to test the 
degree of regularity of these records. 
Table V. 
Stock Keeper , Kennel Register. All Breeds, 1889 — 1891. 
Year 
Dogs 
Bitches 
Total 
Dogs 
per 100 
bitches 
Litters 
Pups per 
litter 
1889 
3591 
3059 
6650 
117-39 
1037 
6-41 
1890 
3415 
2959 
6374 
115-41 
997 
6-39 
1891 
3294 
2832 
6126 
116-31 
964 
6-35 
Totals 
10300 
8850 
19150 
116-38 
2998 
6-39 

VOL. XIV. FT. II. 
10 
