ENDOSKELETON. ANIMALS. 29 



cranium, cutis and cuticle continued from the integuments of the 

 head, and a particular kind of short downy hair, which gives it a 

 velvety appearance. 



Hunterian. 



A. 110. The extremity of the palm of the antler, while in a 

 growing state, injected. 0. C. 164. Himterian. 



A. 111. A transverse section of part of the palm of the antler, 

 while in a growing state, injected, from which the outer 

 velvet-like integument has been removed, to show the 

 vascular periosteal membrane, part of which is turned 

 back. O.C.I 65. Huntenan. 



A. 112. A transverse section of part of the palm of the antler, 

 while in a growing state, injected, to show its delicate can- 

 cellated structure, its vascularity at this period, and its 

 periosteum, part of which is reflected from the bony 

 substance. 0. C. 166. Huntenan. 



A. 113. A horizontal section of part of the palm of the antler, 

 while in a growing state, injected, and showing the same 

 circumstances as the preceding preparation. 0. C. 167. 



Hunterian, 



A. 114. The outer layer of bone and the periosteal covering of 

 part of the palm, and of one of the branches of the growing 

 antler, highly injected, and deprived of the earthy material 

 by being steeped in acid, so that the ramifications of the 

 vessels in the substance of the bone are more clearly shown. 

 One of the external vessels of the periosteum derived from 

 branches of the external carotid is also exposed. 0. C. 168. 



" We find it a common principle in the animal machine, that 

 every part increases in some degree according to the action 

 required. Thus we find muscles increase in size when much 

 exercised ; vessels become larger in proportion to the necessity of 

 supply, as for instance in the gravid uterus ; the external carotids 

 in the stag, also, when his horns are growing, are much larger 

 than at any other time : and I have observed that in inflammation 

 the vessels become larger, more blood passes, and there appear to 

 bo more actions taking place; but the nerves do not seem to 



