BIBLIOGRAPHY 103 



growth or disappearance of substrate — rather than at the same chron- 

 ological age. 



The physiologist often, perhaps inevitably, overlooks problems of 

 taxonomy and morphology. Particularly in rather difficult genera like 

 Penicillium and Aspergillus, the careful description of cultures with 

 at least some indication that the species has been correctly named is of 

 definite value to the next student of the problem. The question of 

 morphology arises in a different context in the fungi, in that conditions 

 of growth or special treatments employed in preparing cells may 

 drastically alter the ratio of different kinds of cells, e.g., the ratio of 

 spores to mycelium or, even more important, the ratio of living to 

 dead cells. It should not be necessary to labor this point. 



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