495 
Protoplasm in Coenocytic Hyphae. 
Rhizopus nigricans at a temperature of 28° C., and found it 
to average 3-3 mm. per minute. This is about twice as fast 
as the rotation in Nitella , and four times that of the circu- 
lation in Tradescantia. It does not, however, equal the rate 
of streaming in the Myxogastres, as given by Hofmeister 1 . 
Woodcut 8 (Fig. 1). 
Part of mycelium of Rhizopus nigricans grown upon nutrient gelatin. 
The arrows indicate the direction of the currents. 
As seen under a convenient adjustment of the microscope, 
it has a surging precipitate flow, very striking to any observer, 
even to one accustomed to the diversity of microscopic life, 
and reminds one of the flow of blood in the capillaries of 
a Frog’s web. (See Woodcut 8.) 
1 Lehre von der Pflanzenzelle, 48. 
