ANATOMY AND PHYSIOLOGY OF THE HORSE^S FOOT. 157 
tionary, and they would therefore have been less in size than 
the healthy feet after a certain time. 
It follows from these considerations, that the increase of 
the horn and hair is regulated by nervous influence; and 
that when, after neurotomy, sensation is still maintained by 
nervous filaments, or the divided nerves are united by adven¬ 
titious tissue, this growth becomes diminished, though regular. 
And yet the nervous continuation with the skin cannot be 
invoked, for how did it happen that the shaved hairs grew 
more rapidly on one foot than the other ? How was it that 
with the third horse, in which the continuance of sensation 
at the coronet was remarked after the operation, the growth 
of the hair was effected much more rapidly than before the 
experiment ? 
The conclusions at which Brauell arrived were as follows: 
1. That in feet not deprived of sensation, the growth is 
greater at the sides than at the anterior part, for in the first 
experiment this only increased 24 and the sides 3: in the 
second experiment 15, the inner side 164, and outer side 
17J; while in the fourth experiment the anterior portion 
grew 164, the inner 19, and the outer 204. 
2. That the outer side grows more than the inner. 
3. That after the arrest of nervous influence, the re¬ 
lations were— 
1st Expt.—Anterior part 34; outer side 4J; inner side 4. 
2nd do. — do. 214 > d°. 19 j; do. 244» 
4th do. — do. 21; do. 26; do. 21. 
It is to he remarked that the growth in the second and 
fourth experiments was not very regular; that the increase of 
the inner side was diminished in the first and third, and 
augmented in the second, and that there was an arrest of 
growth in tho anterior and inner portions in the fourth 
experiment. 
Grohn also took exact note of the temperature of the 
healthv and neurotomised feet, as well as the external air, and 
that of the stable, &c., and concludes these observations by 
saying: 
1. The temperature of the skin in the posterior part of the 
foot is more elevated by from 3°, 5°, and 8°, than in front 
of the coronet, whether or not the limb has been neu¬ 
rotomised. 
2. That the temperature of the skin in certain points is 
higher at times than elsewhere, and that these variations are 
not insignificant. 
3. That the variations are greater and more frequent, 
