126 



C. M. JACKSON 



TABLE 8 



The musculature; average absolute weight, average -percentage of net body-weight 



and range indicate^ 



DESCRIPTION OF RATS 



Normal at 3 weeks (Jackson and Lowrey) . . . 



Controls at 3 weeks 



Body-weight constant 3 weeks (age of 3 to 6 weeks) 

 Body- weight constant 5 weeks (age of 3 to 8 weeks) 

 Body- weight constant 7 weeks (age of 3 to 10 weeks 

 Body-weight constant 10 weeks (age of 3 to 13 weeks) 

 Body-weight constant 13 weeks (age of 3 to 16 weeks 



Normal at 6 weeks (Jackson and Lowrey) 



Controls at 6 weeks 



Body-weight constant 2 6 weeks (age of 6 to32 weeks) 

 Normal at 10 weeks (Jackson and Lowrey) . . 



Controls at 10 weeks 



Bodj'-weight constant 25 weeks (age of 10 to 35 weeks) 

 Controls at 32 and 35 weeks 



ABSOLUTE WEIGHT 

 (and range) : GRAMS 



6.67 



7.81 (6.90-9.82) 

 7.04 (5.51-8.05) 

 6.46 (5.68-7.70) 

 7.62 (4.58-10.87) 

 7.90 

 7.50 

 21.10 



14.90 (14.85-15.0) 

 16.90 (15.30-18.5) 

 55.10 



55.80 (44.00-69.2) 

 31.20 (30.10-33.9) 

 81.20 (64.80-119.7) 



relative weight 

 (and range): 



PER CENT 



26.9 



31.2 

 31.8 

 32.1 

 32 

 31.0 

 29.4 

 32.7 

 35.3 

 35.7 

 41.1 

 41.6 

 40.1 

 42.6 



(20.1-30.2) 

 (29.5-35.3) 

 (25.1-34.7) 

 (31.3-33.2) 

 (24.8-36.4) 



(26.1-35.3) 

 (35.0-35.6) 

 (34.8-36.6) 

 (37.4-49.1) 

 (39.3-44.5) 

 (39.7-40.7) 

 (39.0-50.3) 



TABLE 9 



Viscera and remainder; average percentage of net body-iveight and range indicated 



DESCRIPTION OF RATS 



Normal at 3 weeks (Jackson and Lowrey) 



Controls at 3 weeks 



Bocfy- weight constant 3 weeks (age ot 3 to 6 weeks) 

 Body-weight constant 5 weeks (age of 3 to 8 weeks) 

 Body-weight constant 7 weeks (age of 3 to 10 weeks) 



Normal at 6 weeks (Jackson and LowTey) 



Controls at 6 weeks 



Body-weight constant 26 weeks (age of 6 to 32 weeks) 

 Normal at 10 weeks (Jackson and Lowrey) . . 



Controls at 10 weeks 



Body- weight constant 25 weeks (ageof lOto 35 weeks) 

 Controls at 32 and 35 weeks 



RELATIVE WEIGHT OF 



VISCERA (AND RANGE) 



PER CENT 



21.3 

 20.5 

 25.0 

 26.8 

 22.2 

 20.4 

 19.6 

 19.5 

 16.0 

 14.3 

 16.3 

 12.9 



(20.1-24.8) 

 (17.9-24.8) 

 (20.7-29.2) 

 (25.0-28.5) 

 (19.4-26.0) 

 (18.4-22.9) 



(19.1-19.9) 

 (14.9-17.2) 

 (13.0-15.7) 

 (16.1-16.8) 

 (11.9-13.5) 



relative weight of 

 'remainder' 



(AND R.\NGE) 

 PER CENT 



12.9 

 10.5 



13.6 

 2.3 

 10.0 

 12 

 19.1 

 16.4 

 12.5 

 13.6 

 12.4 

 17.0 



(4.0-19.9) 



(2.6-15.6) 



(7.1-21.6) 



(1.9-2.7) 



(2.5-16.9) 



(6.5-17.1) 



(16.1-16.7) 

 (1.2-18.4) 

 (9.7-16.4) 

 (9.7-13.9) 



(13.7-19.5) 



