ON THE TOXIC EFFECT OF DELETERIOUS AGENTS 
ON THE GERMINATION AND DEVELOPMENT OF 
CERTAIN FILAMENTOUS FUNGI. 
jah. CLARE. 
(Concluded from p. 327.) 
Att acids tested retard germination and early mycelial 
development of the mold fungi. In the case of the mineral acids 
this retarding action is usually evident in oa concentration. 
The acetic acids do not have any perceptible influence at this 
dilution. Cultures which are only slightly retarded almost 
invariably take on new vigor a few hours after germination, and 
overtake and surpass the checks in development of mycelium. 
This excessive mycelial development is usually accompanied by 
retardation of fruiting, and usually reaches its maximum in 
cultures two or three removes from the inhibiting concentration. 
Cultures in the acetic acids show a greater stimulation of mycelial 
development than in HCl or H,SO,. Cultures in HNO; 
resembled those in the acetic acids in development of mycelium 
but were not so greatly retarded in fruiting. 
Smaller quantities of acid on an average proved injurious to 
20” 
2048 ; 
distinctly detrimental. In this respect the others came 11 ©” 
following order: Botrytis, 23; Penicillium, a8; Aspergillus, 425 
Sterigmatocystis, 64. 
CEdocephalum was also the most easily inhibite 
inhibiting coefficient being 72; followed by Botrytis, 
lium, 100; Aspergillus, 104; and Sterigmatocystis, 200 
Botrytis, however, was the most easily killed. T 
in this respect was: Botrytis, 100; (Edocephalum, 1373 
gillus, 272; Sterigmatocystis, 369; and finally Penicillium, ' ‘ 
spores showed by far the greatest resistance, represented by 
378 [DEcEMBES 
being on the average 
the 
(Edocephalum than to the other forms, 
d, its relative 
76; Penicil- 
he order 
Aspet- 
