456 ANDREWS: PROTOPLASMIC STREAMING IN Mucor 
As to the historical account of the study of protoplasmic 
movements in the fungi it may be said that this has been given 
in sufficient detail by Schréter* and will only be mentioned here 
as reference makes necessary. Also Arthurf has made several 
references to brief accounts of protoplasmic movements in fungal 
hyphae. It will be seen by referring to the literature mentioned in 
this paper that the work of Woronin{ appeared 31 years before 
the paper of Arthur. Since then a number of contributions on 
the subject of protoplasmic movements in the fungi have appeared, 
but the amount of study which this subject has received is very 
small in comparison with the attention that has been paid to such 
movements in the cells of other plants. And furthermore we 
find that protoplasmic movements in the fungi have been known 
for only about 45 years,{ whereas in other plants such movement 
was observed 137 years ago, when Corti saw it, in 1774, as stated 
by Pfeffer.§ 
PLANT MATERIAL USED 
In these investigations I have used Mucor stolonifer, Mucor 
Mucedo, and Phycomyces nitens. Of these three Mucor stolonifer 
and M. Mucedo were used in all my experiments. I found it in- 
convenient to use Phycomyces nitens, since as is well known the 
spores of this fungus seem to live for only a few months. I have 
been able at different times to keep some of the spores of P. natens 
for as much as three months, but even then the majority of the 
spores with which I began to experiment refused to germinate. 
Therefore, in these experiments, while some spores germinat 
after a month or more, the uncertainty of their growth cau = 
not to use them so extensively as I did the other two forms above 
named. At all events it would be an interesting study and well 
worth investigating to ascertain, if possible, the reason for this 
short period of life that is shown by the spores of P. mitens. It 1s 
stated by Pfeffer|| that the spores of most molds often live from 
one to three years. I have yet on hand the spores of Mucor stolon'- 
* Schréter, Alfred. Flora g5:1. 1905 
t+ Arthur, J.C. Annals of Botany 2: 491. 1897. 
t Woronin, M., cited by Ternetz in Jahrb. Wiss. Bot. 35: 274- 190 
§ Pfeffer, W. Plant Physiology (Eng. Transl.) 3: 289. 1995- 
|| Pfeffer, W. Plant Physiology 2: 328. 1905. 
0. 
