RHIZOPUS EOT OF STRAWBERRIES IN TRANSIT. 5 
the morphological characters are concerned the fungus under consid- 
eration when grown under certain conditions agrees very well with 
his description of Rhizopus nigricans Ehrb. It is evident from his 
description that Hanzawa studied the fungus under rather uniform 
conditions, as the measurements given by no means include its limits 
of variability. 
Fig. 1. — Effect of Rhizopus nigricans on strawberries of the Missionary variety which 
had stood for two days at room temperature. Each berry in the flask at the right 
had been inoculated with Rhizopus nigricans. 
In connection with studies on the humidity relations of this fungus 
(p. 7), the writers found that at a temperature of 20° C. the length 
of the sporangiophore and the size of the columella vary greatly in 
air of different humidities. For example, in air with a saturation 
deficit of 17 mm. of mercury, 2.3 per cent relative humidity, spo- 
rangiophores are mostly 1 mm. in length, while in saturated air they 
are from 3 to 4 cm. long. In air with a saturation, deficit of 17 mm. 
of mercury the columellas are mostly 95 to 100 ^ in width ; in saturated 
air they are mostly from 150 to 1<S0 \)< wide. The size of spores and 
