Tin: *I<I:I.I: 



In birds, tho posterior limbs alone assume the function of columns 

 inport. The anterior limbs, formed for flight, constitute the 



SKELETON F THE CW. 



Fig. :-. 





Tin- nmnlKT of boiit-s oiiU'rin^ into tin- ciimjn^it:>ii -t' tin- ^k. 1 ; 

 tli. .l..]ii<-ticutr.l ;ininuil>. an-ivi-l at tin- a-lult \ n<>il ct' lit. . varies according 



