3. No environmental variation ; all environmental 

 conditions assumed to be maintained at their 

 initial values throughout culture period. 

 Hence no difference between cultures in this 

 regard. 



Comparison of cultures of di fferent fungi . 



1 Internal conditions (nature of fungus) 



1. Initial internal conditions, different for four 



different fungi, each 3et roughly defined by 

 fungus designation. 



2. Direction and rate of internal variation during 



culture period may be different from cul- 

 ture tc culture. This variation always to 

 be stated as within the given limits of ini- 

 tial internal conditions and external con- 

 ditions, a3 above. 



11. Txternal conditions (environment) 



1. Initial environmental conditions excepting 



temperature considered alike for all 

 cultures. 



2. Initial temperature conditions either alike or 



different from culture to culture. 



3. No environmental variations (see above), hence 



no difference between cultures in this re- 

 gard. 



The 3tudy here reported is thus seen to comprise five 

 different studies. The influence of maintained temperatures 

 on the growth rare of each of four fungi was measured, under 

 the given non- temperature conditions which are considered as 

 initially alike and under the given initial internal condi- 

 tions, also considered as alike for all cultures of the same 

 fungus. The fifth study comprises the comparison of the four 

 fungi as to their temperature relations under the given set of 

 non-temperature, external conditions. 



Looked at from the mathematical viewpoint, the pres- 

 ent investi ration involves six 



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