122 
The  Pineal  Gland. 
f  Am.  Jour.  Pharm. 
\      March,  1915. 
On  the  hypothesis  that  precocious  development  is  due  to  hypo- 
pinealism,  the  first  work  was  done  in  anticipation  that  feeding  would 
retard  development  and  prolong  the  presexual  life.  This  was  begun 
on  two  chicks  incubated  in  the  laboratory.    Beginning  at  the  age  of 
Fig.  i. — Position,  relations  and  relative  size  of  the  pineal  gland.   Taken  from  beef  3  years  of  age. 
two  days,  one  was  fed  10  mg.  veal  pineal  tissue,  three  times  weekly, 
the  other  (and  in  all  cases  of  controls)  was  fed  a  blank  tablet  of  milk- 
sugar.    The  difference  in  growth  should  be  noted  (Table  I). 
Table  I. 
Results  of  Feeding  Pineal  Gland  to  Chicks. 
Third  week, 
grammes 
Sixth  week, 
grammes 
Ninth  week, 
grammes 
Twelfth  week, 
grammes 
Pineal  
219.5 
557-7 
895 
925 
Control  
92.5 
286.5 
550 
700 
I27.O 
271.2 
345 
225 
