6 



HENRY H. DONALDSON 



this treatment reduces the length of the femur by 0.70 per cent 

 making it 99.30 per cent of the fresh length, the tibia by 0.73 

 per cent making it 99.27 per cent of the fresh length; the foot 

 (tarsus-pes) by 1.54 per cent making it 98.46 per cent of the fresh 

 length. 



These corrections were applied before the data were used in 

 tables 7 and 8. 



TABLE 6 

 Body weight per millimeter of total length. Averages from groups of three 



R. pipiens. 



BODY WEIGHT 

 IN GRAMS 



14.9 

 23.2 

 30.8 

 43.2 



BODY WEIGHT 

 PER 



MILLIMETER, 

 IN GRAMS 



.102 

 .135 

 .168 

 .218 



R. esculent a 1904. 



15.9 

 22.0 



35.0 [2]* 

 40.2 



.114 

 .134 

 .199 

 .20S 



R. esculenta 1909. 



R. temporaria 1904. 



.146 

 .177 

 .225 

 .262 



.107 

 137 



.162 

 177 



R. temporaria 1909. 



1S.0 [4] 



25.2 



26.9 



29.5 



34.8 



116 

 151 

 159 

 173 

 191 



(A) AVERAGE AMOUNT OF BODY WEIGHT FOR EACH MILLIMETER 



OF TOTAL LENGTH 



The general form of the specimens examined is obtained by 

 dividing the body weight by the total length (table 6). The 

 data in this table are given in Chart 1 and show that in the years 



