ADRENALS OF MAMMALIA. 571 



are of equal size : in the sixth month the kidneys have gained in 

 weight so as to be as five to two : and at birth they are as three 

 to one : after this time the adrenals diminish so as in the adult to 

 be only -j^th the size of the kidney. Occasionally they entirely 

 waste away. 



The large proportional supply of nerves to the mammalian 

 adrenals from the contiguous plexuses (coeliac and renal) of the 

 sympathetic system is worthy of note. 



