478 



MINNA E. JEWELL 



Table 3 gives the CO2 production in KOH of six sets of four 

 tadpoles each and the regeneration of the same tadpoles. Those 

 in the higher concentrations (30, 35, and 40 cc. O.OIN KOH per 

 400 cc.) died without regeneration. Figure 3 (drawn from table 

 3) represents graphically the increase in CO2 production with 

 increased concentration of base, and gives a curve almost iden- 



TABLE 3 



Carbon-dioxide production and regeneration in KOH. Length of tadpoles 



66 to 86 mm. 



0.01 N KOH IN 400 cc. H2O 



Days survived 



Weight in grams 



Total CO2 in cc. 0.01 N Hj CO3. 



Average daily CO2 



Average CO2 per gram per day. . 



40 



1.0 



6.9 



51.3 



51.3 



7.3 



Regeneration 



tical with the curve shown in figure 4, which was drawn from 

 the data of Loeb and Wasteneys ('13 b) for the increase in oxygen 

 consumption in increasing concentrations of bases. Figure 7 

 gives the curves of growth for the three sets of tadpoles which 

 survived to undergo regeneration. It shows clearly the decrease 

 both in the rate of regeneration and the total amount regener- 

 ated in increasing concentrations. Figure 8 (drawu from the 

 data of table 3) compares the effect of the various concentrations 



