THYROID — BODY WEIGHT ON AGE 169 



Formulas (30) and (31) were used for table 71 in accordance 

 with the restrictions indicated. 



Weight of Thyroid ox Body Weight (Hatai, '13) 



Weight of thyroid (sexes combined) = 

 0.0000973 (Bd. wt. + 27) + 0.0139 log (Bd. wt. + 27) - 0.0226 (32) 



Formula (32) was used for table 71. 



Weight of Nitrogen on Body Weight (Hatai, '05) 



To determine the amount of nitrogen eliminated by the rat 

 during twenty-four hours at different body weights. Ration: 

 Uneeda biscuit and water only — Chicago colony. 



233 + (3 X log Bd. irt.) OQQ _l_ /Q y- Inn Rd int \ 



Nss 10 1 orlogN = M + {6 X ^° 9 m ' wL) (33) 



where N = total nitrogen in milligrams and Bd. wt. = body 

 weight in grams. 



Formula 33 is based on the data in table 42. 



GROUP I. ALBINOS 



second division: formulas based on age 



Body Weight on Age from 10-365 Days, Hatai (ms '14) 



The formulas (34) (35) (36) (37) apply only to the series of 

 data published by Donaldson, Dunn and Watson, ('06.) 



Body weight on age in days — males = 



11.199 + 0.0475 Age + 0.0184 Age 2 (34) 



[10 < Age < 80] 



= 448 log Age- 0.52 Age - 678.2 (35) 



[80 < Age < 365] 



