:!"*:: V* '' GENERAL BIOLOGY 



point. In general, however, growth is accelerated 

 both in plants and animals by a slight increase of the 



1848 

 MARCH 11TH 



23 D 

 25 n 



APRIL 4TH 



MEAN TEMPERATURE 

 60FAHR. 56FAHR. 63 3 FAHR. 



3Q 



FIG. 36. Chart showing the correlation between the stage of de- 

 velopment of the frog on successive days and the temperature at which 

 it has developed. (From Davenport, after Higgenbottam.) 



normal temperature. This is well illustrated by the 

 accompanying chart (fig. 36). 



Effect of Chemical Agents. Since growth can 

 take place only at the expense of food substances 



