145 
which is is aha in the formation of Pe conidia. This 
g occurs is represent time hie days. Put 
briefly, the fungus has, in a few aie 8, P dined to a physiological 
condition which is usually only récit after a period of about 
four week 
at which pe meet occurs is re sated in time fet 
of several —o t by specifically ee vo ga con- 
ditions and here the Sakedtering factor is of a cal nature* 
he life proved’ are so accelerate that ee same Soh yecdagegs 
age — e reached in the course o 
I 
opimaixily controlling microsporogeny is apparently one of age, 
and it would appear highly probable that in a a 
ent u 
0 x interfering ae saages in the medium. Both meat 
bouillon and the earlier peptone media are of very epi Spa and 
little known. chemical deinpentr, ri these ab- 
atop Be ete einere 
Sractihogiion and other con 
occur until the fungus is about one mo 
The importance of this process in the life history of the fungus 
is that it provides a means whereby the eae when under 
‘conditions unfavourable for dissemination and gro may pro- 
ce immense numbers of a type of spore so Foteate and light 
* See Ward, H. M.: Phil. Trans. Roy. Soc. Lond. B. 191, 1899, and 
Brierley, W. B.: Ann. Bot. xxxi. 1917. 
