THE RABBIT. 33 



(ventral to the larynx), the adrenals or supra-renals 

 (anterior to each kidney, fig. 64) and the pineal and 

 pituitary bodies of the brain. Removal of the two former 

 (in surgical operations, e.g.} results in serious diseases, 

 which can, however, be warded off to a large extent by 

 injection into the blood of the secretions of the same glands 

 of another animal. Hence they evidently add some 

 necessary secretion to the blood. The spleen (lying near the 

 stomach) and the thymus (ventral to the heart, and a large 

 organ in young rabbits, but disappearing in adults), which 

 are often included with the others, appear more specially 

 concerned with the blood-corpuscles, as is also the red 

 marrow of bones. The detailed consideration of all such 

 organs is beyond our present purpose. 



ZOOL. 



