PERCENTAGE OF WATER IN BRAIN AND CORD 105 
From 10 to 50 days the following correction formula (45a) is 
used: 
Correction (minus) =0.0006 Age? —0.0386 Age +0.3 (45a): 
The values thus obtained are subtracted from the computed 
values for the males at the corresponding ages. 
From 50 to 65 days no correction is made. 
From 65 days to 135 days, correction is made according to 
the formula (45b) 
Correction (plus) =0.823 log (Age +1) —0.000542 (Age +1) — 1.4616 
(45b) 
From 135 and 165 days the correction is uniform thus: 
Correction (plus) =0.22 (45e) 
From 165 to 365 days correction is made by the following — 
formula: 
Correction (plus) =0.22 +0.0005 (Age — 165) (45d) 
The foregoing (43)—(45d) replace the formulas given in the 
paper by Donaldson, ’10. 
Formulas (43)—(45d) were used for table 74. 
Table 74, which follows, is reprinted from The 
Rat (Donaldson 715). It gives, for the albino rat, 
the brain weight and the percentage of water in 
the brain and in the spinal cord for each sex, 
on age. 
