524 



ON INCREASE IN SIZE 



[PT. Ill 



certain definite magnitudes. Fig. 84, constructed from the data of 

 all the relevant investigations, shows a frequency polygon for the 

 values of fx associated with growth. Crozier's polygon for all fj, 

 values (286 investigations) is described by a continuous line, and 

 demonstrates the well-known modes at 8000, 11,000 and 16,000, as 

 well as the smaller ones at 20,000 and above. These include all bio- 

 logical reactions which have been studied at different temperatures. 

 But when only such fj, values as have been obtained for growth are 



o 



CT»6 



O 4 



C 





— Crosiers frequency 

 polygon of all jx's. 



M Embryonic growth. 



— Growth as a whole 

 I.e instances of 

 adult + emb. 



l\ 



l\ 

 I 1 

 / 1 



2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 



JU XIOOO 

 Fig. 84. 



plotted, the picture is quite a different one, for the modes do not 

 correspond at all with those of the wider series. For the growth- 

 process, they exist at about 10,000, from 17,000 to 21,000 and at 

 27,000. The first of them falls between two peaks of Crozier's polygon, 

 and the second, though represented there, equals, in this narrower 

 consideration, the great 16,000 oxidation mode. The growth- 

 frequency polygon obviously has little to do with oxidations, which 

 are here graphically seen not to be the limiting factors in the growth- 

 process. If now embryonic growth alone is considered, an even 

 narrower situation is disclosed, for embryonic growth has a peak 

 at 10,000, practically nothing at all between 13,000 and 19,000, and 



