SCIIIN. YOSCHIDA 
i8i 
dency. Nothing of this, however, is to be seen on either the Ergot or the 
Callosity." 
The question may be put by other theorists: "Why, if the Callosity 
and Ergot are rudimentary digits, are they found in such impossible posi- 
tions?" 
Before answering this question, I should like to give the results of my 
observations of the Callosity and the Ergot. I have already published the 
greater number of these observations of the Callosity in 1913. Since that 
time, however, I have made further studies of the Callosities of several other 
species of Equidae and of the'Ergots of all Equidae. 
Race name 
Fore Callosity 
Hind Callosity 
Length 
Breadth 
Height 
Length 
Breadth 
Height 
Belgian 
left 
right 
cm. 
3,6 
3,4 
cm. 
5,6 
5,46 
cm. 
6,23 
6,00 
cm. 
2,16 
2,33 
cm. 
3.7 
3,65 
em. 
4,66 
4,51 
Persian 
left 
right 
3,82 
3-62 
4,7 
4,6 
6,4 
6,4 
2,1 
2,1 
4,2 
4,1 
4,1 
4,5 
Clydesdale 
left 
right 
3,1 
3>i 
4,0 
3,7 
4,05 
3,8 
2,4 
2,4 
3,6 
1,65 
2,6 
3,05 
English 
Thoroughbred 
left 
right 
1,4 
1,45 
2,9 
2,98 
0,7 
0,75 
0,87 
0,75 
1,5 
1,55 
0,55 
0,55 
American 
Trotter 
left 
right 
2,0 
2,0 
3,9 
3.8 
0,76 
0,8 
1,5 
1,4 
2,4 
2,2 
0,66 
0,6 
English Thorougli- 
Ined, reared in Aus- 
tralia. 
left 
right 
2,0 
2,0 
4,0 
3,8 
0,8 
0,6 
1.7 
1,7 
2,3 
2,3 
0,5 
0,4 
Japanese horse X 
English Thorough- 
bred ( A English 
Thoroughbred.) 
left 
right 
2,3 
2,5 
4-1 
4,2 
0,7 
0.6 
1.5 
',5 
2,0 
2,0 
0,46 
0,43 
As the above table shows, the Callosities of the heavy horses are larger 
and more fully developed than those of the lighter breeds, but in both cases 
they are larger on the fore than on the hind feet. 
With donkeys and zebras it is only to be found on the fore feet. By 
examination of the stuffed specimens of different breeds in the British Museum, 
I have obtained the following results : 
