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The action of certain volatile substances and gases on the germination and growth of mould fungi is of both theoretical and practical interest. Little attention has been paid hitherto to the manner in which various substances retard the growth of mould fungi or to the differences in their effects. It is the aim of this paper to consider comparatively some of the more important ways in which growth may be influenced by the presence of certain growth-retarding substances. Previous investigations have usually dealt with the effect of some single substance and have failed, in consequence, to emphasise those characteristics most useful in comparing the action of one substance with that of another. Reference to these investigations will therefore be left until the final discussion when they can be considered in the light of the present findings.

The action of certain volatile substances and gases on the growth of mould fungi