86 



THE STRUGGLE FOR EXISTENCE 



experiments of 1932 coincided almost completely with those of the 

 year before. A similar coincidence exists in the ratio of the alcohol 

 production of one species to that of another, which is to be found in 

 Table VII. In this manner the coefficients of the struggle for existence 

 remain invariable under definite conditions in spite of the changing 

 absolute values of growth. 



TABLE VI 



Parameters of the logistic curves for separate growth of Saccharomyces cerevisiae 

 and Schizosaccharomyces kephir under aerobic and anaerobic 



conditions {1932) 



Saccharomyces anaerobic 



Saccharomyces aerobic 



Schizosaccharomyces anaerobic 

 Schizosaccharomyces aerobic . . . 



THE VALUE 

 OF N AT 



t = 



0.112 

 0.152 

 0.335 

 0.401 



TABLE VII 



Coefficients of the struggle for existence and the relative alcohol production under 



aerobic and anaerobic conditions 



* Here does not coincide with -. 



a 



(3) Let us now turn to the aerobic experiments (1932) and compare 

 them to the anaerobic ones (1932). As might have been expected, 

 in aerobic conditions the absolute values of growth of the yeast in- 

 crease considerably (Fig. 16). What is especially striking is the 

 behavior of Schizosaccharomyces. Though it is a slowly growing 



