Fig. 40. — X-ray photograph of the front view of a homing Pigeon, showing the 

 bones clearly through the surrounding flesh. Observe the light, spongy 

 character of the skull and the bones of the limbs, the latter appearing almost 

 hollow. The crop filled with corn is visible spread out at the base of the 

 neck, and low down in the body, near the right thigh, the grit and pebbles 

 within t)ie gizzard are very distinct. About the tarsus of the right leg is 

 seen the metal tag which was used for the identification of the living bird. 

 (Photographed by Dr. Henry G. Piffard.) 



63 



