INTRODUCTION. 7 
antlers have attained full dimensions it is difficult for 
the circulation to be maintained through so thin a mem- 
Fic. 3.—A pair of antlers from a Roe-deer (Capreolus caprea) with an 
ossified node upon them (Mus. Royal College of Surgeons). 
‘brane as the “velvet,” and as a consequence it shrivels 
and peels off; the bone beneath is deprived of blood 
