294 GEOWTH OF PARTS AND ORGANS 



= 82.756 - 2.103 log Age {Phase 2) (48) 



[40 < Age < 160] 



= 77.671 + 0.00537 Age - 0.000016 Age^ {Phase 3) (49) 



[160 < Age < 365] 



To transform any determination for the male into that for 

 the female, the value for the male at a given age (see formulas 

 (47) (48) (49)) is modified by a plus correction (Hatai). 



Correction {to be added) = 0.0555 log {age + 3) - 0.0606 (49 a) 



[10 < Age < 365] 



The foregoing (47)-(49 a) replace the formulas given in the 

 paper by Donaldson ('10). 



Formulas (47) (48) (49) (49 a) were used for table 157. 



Percentage of Water in Spinal Cord (Donaldson '16) 



The formulas do not apply under 10 days of age. The data 

 for the first ten days are from direct observations. 



Percentage of water in spinal cord — male = 



87.976 - 0.494 Age + 0.00364 Age^ {Phase 1) (50) 



[10 < Age < 40] 



= 100.3 + 0.0548 Age - 17.7 log Age {Phase 2) (51) 



[40 < Age < 150] 



= 62.186 - 0.0121 Age + 4.434 log Age {Phase 3) (52) 



[150 < Age < 365] 



To obtain from the values for the male at different ages the 

 corresponding value for the female, several corrections are re- 

 quired and these differ according to age. 



From ten to fifty days the following correction formula (52 a) is 

 used: 

 Correction {to be subtracted) = 0.0006 Age^ - 0.036 Age + 0.3 (52a) 



