Abstract
The rate of germination of mould spores is measured at known temp. on "soils" in equilibrium with known humidities. The rate of germination decreases with decrease of humidity. The range of humidity allowing germination is greatest at the optimum temp. and decreases the further the temp. is removed from the optimum. It is increased by presence of nutrients. Germination is independent of the surface if it provides nothing assimilable to the spores. The relation between the growth of a "colony" and temp., humidity, and nutrients resembles qualitatively that found for the germination of spores.

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