COHN’s ‘‘BEITRAGE ZUR BIOLOGIE DER PFLANZEN.” 217 
oval gonosphere. Since the whole contents of two, sometimes 
ilise 
re 
without extrusion of a gonosphere; these were not seen to germi- 
nate. As for the first-mentioned resting-spores, they immediately 
develope zoosporangia after remaining dormant for about a month. 
amination 
from Rhizidium (to which A. Braun and Schenk paca the Euglena- 
perasite) i the fact that the latter is two-celled, on of the cells being 
bra: and the other acting as zoospo ets e also indi- 
d i* 
careful culture-method a spores of Cyathus striatus were observed 
producing a branched mycelium which, where the conditions were 
(Schnallenzellen) which, like the ordinary mycelial branches, in the 
urse of development often become united one to another. Forma- 
tion of fruit was not observed in the culture-fluid, but all stages of it 
were found in a state of nature. In this connection it is sufficient to 
mycelium of Crucibulum vulgare was fo be much like that of 
Cyathus, except that no Theilzellen were formed, and development 
of in culture-fluid) was e sentially 
ding of spores while still inside the sporangium, and penetration of the 
of the latter by the emitted filaments, was observ ed in this 
rb = 
In a fourth memoir on the germ-theory rere zur Biologie 
der Basler, — Cohn tries to answer the questi , Why is it that 
exposure to emperature of 100° C is not more ie sufficient to 
dank atonal life, since all other organisms succumb on exposure 
it L *44..4 tha noth? 
* Tt willb 
less than sensational id mee "ihe pth of the spore of Agaricus coprophilus 
(Bot. Zeit., jhe p- 649), have — considerable modification, for he con- 
‘iders the of the germination of spermatia sufficient evidence 
em 
7 
