210 
NATURE NOTES 
A. 
B. 
C. 
rnOTOGRAPIIS OF TlIRKK VViNGS FOR COMPARISON OF TIIF.IR StRUCTURPP 
A, that of a Pterodactyle ; B, that of a Hird ; C, that of a Hat. 
(From “ Extinct Animals.” Hy kind permission of Messrs. Constable.) 
