Diagram of a Bird's Vascular System. Ventral Aspect. 

 The two halves of the Heart are drawn as if separate to shew the complete double circulation. 



L.A. and L.V. Left Atrium aud Ventricle ; K.A. and Il.V. Right Atrium and Ventricle. 

 The Arteries, except the Pulmonary (a.jnihn.) which is dotted, are shaded :—o(iu, arcus 



