296 JOHN C. DONALDSON 
the adrenal found in table 71 of the rat (Donaldson,’15) and 
shown in chart 20 of the same, it will be seen that the curves are 
similar in form and relation, but that the values in chart 4 are 
about one-half what they should be to satisfy the weights given 
for the respective ages in table 71. Jackson (717) found a similar 
VOLUME 
CUBIC M.M 
50 100 150 200 250 300 
Chart 3 The growth of the female adrenal cortex and medulla. The lines 
have the same significance as those in chart 2. 
discrepancy between the volumes and the weights, when recon- 
structing the hypophysis from serial sections. He suggests 
that shrinkage by reagents and the weighing of a certain amount 
of tissue which is not included when reconstructing the organ 
explain this. Recent work at The Wistar Institute mdicates 
