214 



PHYSIOLOGY OF BACTERIA 



Figure 21 shows the temperature coefficients of growth 

 of three fungi, after Fawcett (1921). The curves might 

 be explained as being essentially straight lines which 

 are deviated at both ends, and which indicate, in their 



Fig. 21. 



-Variation of the temperature coefficient of growth with the change 

 of temperature, demonstrated with three fungi. 



unhampered path, a normal temperature coefficient of 

 about 2 to 3 (data see Table 55, p. 218). 



Some compound, or group of compounds, in the cell 

 is the cause of growth. This agency, in higher organ- 

 isms, is located in the chromosomes. If the cell is 

 heated, this agency is destroyed; there is no more growth. 



