Fic. 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 the gizzard are very distinct. About the tarsus of the right leg is 
seen the metal tag which was used for the identification of the hving bird. 
(Photographed by Dr. Henry G. Pitfard.) 
