490 ANDREWS: PROTOPLASMIC STREAMING IN Mucor 
seconds. The specimens for these experiments were grown at the 
optimum temperature and treated in exactly the same way except 
that in the last case the strength of the ether was greater. The 
amount of time, however, required for the resumption of streaming 
in the last case was much increased. If the cane sugar was weak- 
ened, as was done in this case by using only a 3 per cent solution, 
the streaming began again in about 25 seconds. When the ether 
was washed away from the still protoplasm with water, streaming 
began as before. 
When specimens prepared as the above were covered with a 
2 per cent solution of cane sugar, streaming recommenced in 
about one minute on the average but was less active than in the 
stronger solution of sugar. A 5 per cent solution of sugar caused 
streaming to commence in 30 seconds, and a 10 per cent solution 
of cane sugar caused a recommencement of streaming under the 
above conditions, almost instantly and very actively in all cases, 
to the sugar. 
When the specimens are placed in a % per cent solution of 
ether, streaming stops immediately, but it can be caused to te 
commence by adding a sugar solution if this be applied at once. A 
5 per cent solution of sugar caused streaming to commence in 30 
seconds. The time, however, will vary according to the strength 
of the solution, as shown above, and the length of time the ether 
has acted. In respect to the water solutions (14 per cent ether) 
above mentioned I can confirm the experiments of Schroter.* 
A saturated solution of ethyl ether was added directly to the 
filaments, and streaming ceased instantly. No acceleration of 
the streaming occurred before it stopped. When the ether was 
ommence. 
washed away at once with water streaming did not rec 
A 1/20 per cent solution of ethyl ether directly applied " 
the fungal filaments causes streaming to begin in them when they 
are in a condition for such activity. This movement continued 
for about the usual time, and when finally the dilute ether was 
washed away with water the streaming continued. This was lg 
of any filaments whether they were branched or not. 
Lee. oe 
* Schroter, loc. cit. 21. 
