652 . BIRDS. 
syrinx or song-box (with vocal chords) at the origin of the 
ne 
Fic. 357.—A falcon. 
mn., Mandible; C., cere; V., nostril; Z.C., ear covert; #h.7., 
thumb wing ; C., wing coverts; D., dorsal coverts; S., second- 
aries; P., primaries; #., rectrices; A., ankle; A74, tarso- 
metatarsus; /., first toe. 
bronchi. Lxpiration ts the more active part of the respiratory 
process. 
