C S’S* 3 
XIV. Observations on the Structure, and Mode of Growth, of the 
grinding Teeth of the Wild Boar, and Animal incognitum , 
By Everard Home, Esq . F. R. S. 
Read May 7, 1801. 
The peculiarities in the mode of growth of the grinding 
teeth of the Sus Ethiopicus have, upon a former occasion, been 
laid before this learned Society, and the similarity of their 
structure to those of the elephant explained. 
The wild boar has been since discovered to have similar pecu- 
liarities, although in a less degree, and taking place at a later 
period of the animal’s life : an account of these is the subject of 
the present Paper. 
When the peculiarities just alluded to were noticed in the teeth 
of the Sus Ethiopicus, it naturally led to the examination of the 
grinding teeth in the different species of Sus ; and, that no such 
peculiarities should be found in any of them, appeared undoubt- 
edly very extraordinary ; but, upon reflecting that they only 
belonged to the second set of teeth, and that the first or tem- 
porary teeth of the Sus Ethiopicus were exactly similar to those 
of the common hog, the idea suggested itself, that a similar 
change might take place in the teeth of the other species, at a 
more advanced period of life; and, that it had not been detected 
in the heads that had: been examined, because the animals were 
too young. 
