VESTIGTAL PARTS: 71 
veterinary surgeon knows; for horses frequently refuse 
food, set their coats, and get out of condition simply 
from the trouble caused by these teeth : as soon as they 
are removed the horse rapidly improves and gets once 
more into condition. This vestigial pre-molar of the 
horse is often omitted in drawings (even in veterinary 
works) of the teeth of the horse, 
It has been clearly shown by the researches of 
Albrecht that man has a smaller number of teeth than 
he formerly possessed. The mouth is often the seat of 
a defect known as cleft palate ; not infrequently children 
affected with complete clefts are furnished with three 
incisor teeth in the jaw which is cleft, and occasionally on 
both sides. In rarer cases an extra incisor tooth may 
make its appearance taking rank, and being co-equal 
with, the normal incisors, This matter has been 
inquired into by many competent observers, and its 
occurrence is beyond all doubt. The most satisfactory 
explanation of the phenomenon seems to be that 
offered by Albrecht; it is to this effect: man normally 
inherits in cach upper jaw germs of three incisors, one 
of these usually becomes suppressed ; in cases of cleft _ 
palate there is more space for the teeth to develop and 
a greater supply of blood to the parts adjacent ; these are 
circumstances favourable to the full development of the 
germ of the third incisor. 
The fact related above is of sufficient interest in itself; 
it is also of importance in a general way because there is 
good reason for the belief that the germs of other teeth 
have been suppressed in the mouth of man, and that the 
wisdom teeth ar ergoing this process. It has 
