306 BOTANICAL GAZETTE [ NOVEMBER 
From time to time attention will be called to the wonderful 
resistance of the fungi to many deleterious agents as compared 
with that of the higher plants. The comparison (or contrast ’) 
in resistance to ionic H is as 800: 1, the average death-point for 
the five species of molds being re HCI, while that of three spe- 
cies of phanerogams is ar HCl. (Heald, ’96, p. 152.) 
On the whole, HCI was at the same time the most completely 
ionized and the least toxic of the acids tested. Sterigmatocystis. 
proved most resistant, for although germination and early myce- 
n n seal | 
— was required 
lial development were distinctly retarded by ery 
to inhibit all the spores, and - for forty-eight hours to kill 
them. Cultures in =, although much retarded in early develop- 
the checks, and 
unt of mycelium 
first noticed in 
ment, had at forty-eight hours quite overtaken 
at seventy-two hours far surpassed them in amo 
produced. Distinct retardation of fruiting was 
o mature its fruit 
hd a : ‘ 
can) Ge required nearly double the time t 
EXPLANATION OF DIAGRAMS. oe 
The initials A., S., C., B., P. stand for the respective i ie 
names of the fungi used. fa 
The fraction of a normal solution placed at the head 9 " 
refers to the space between the vertical lines over which pe 
this space is depicted the result of culturing the various 1 
concentration of the different agents by the symbols de oe 
ot Two lines indicate normal or almost normal develop 
—— Three lines indicate distinct injury- 
Four lines indicate very great injury. 
mination. — 
HM Alternate blocks indicate total inhibition of 8& ee 
ed for vitality 
mum Solid black indicates death of spore when tested S33 
48 hours. 
