i900] CELL AND NUCLEAR DIVISION IN FULIGO VARIANS 225 
stage of nuclear division. We may assume that the nuclei begin 
to divide at numerous isolated points in the aethalium, and that 
the nuclei of adjacent regions begin their division progressively 
inall or only in certain directions. If we consider that the 
division begins in response to a stimulus either external or 
internal, we should imagine the stimulus being propagated in 
one or several directions, from the point of its first effectiveness. 
Strasburger has remarked upon this same wave-like progress of 
the tendency to nuclear division in Trichia, and has compared 
the phenomena there with those in the division of the nuclei in 
a young endosperm of Fritillaria, in which the nuclei at one 
ead of the embryo sac begin to divide first, and the process is 
‘een taken up progressively by the successive nuclei through 
the whole length of the endosperm layer. 
Nuclear division proceeds thus during the whole process of 
eranege, but without any relation whatever to the latter process. 
itanai figures can be found oriented in all possible ways 
‘cc iad furrows described above, and any stage in divi- 
shape or : cep in segments of the dividing cytoplasm of any 
eh a as will be seen from figs. 4-9. As a further exam- 
ha oa can be found with a single nucleus in any stage of 
divisions Ang TI, 13, 15, 16). The details of these nuclear 
described bel ar as I have been able to work them out, will be 
ow, 
—- geal of nuclear and cell division in Fuligo are 
described b a puitely different from those in Trighi as 
Plete ieee at In Trichia nuclear division 1s com- 
“SSS are carried en begins, while in Fuligo the two proc- 
sociated with = simultaneously. The difference may be 
¥ of Fuligo a ies for more rapid ripening of ne sae 
aethalium oe ecording to my observations, the building : 
tWenty-four ay formation of the spores takes place within 
State just bow “ ae is case of Fuligo. Strasburger does oe 
© Sporange of eg time is required for the development te) 
richia, but Lister found that they require from 
two to f 
‘four : 
: days to ripen after their first appearance. 
