BRIEFER ARTICLES. 
NOTES ON THE MAXIMUM THERMAL DEATH-POINT OF 
SPOROTRICHUM GLOBULIFERUM. 
WHILE engaged ina study of an entomogenous fungus, Sporotrichum 
Slobuliferum, aS an economic factor in the destruction of the chinch- 
bug, some experiments were made for the determination of the maxi- 
mum thermal death point of this fungus under various conditions. 
€ experiments were necessarily concluded when only some of the 
more evident results of higher temperatures had been secured as pre- 
liminary to more accurate investigations. Since it proved impossible 
to continue this work much further under similar conditions, some 
Preliminary data are presented which are at least suggestive at times. 
The original culture of the fungus was secured from a beetle, and 
fungus is undoubtedly that which has been determined by Thax- 
ter’ as Sporotrichum Slobuliferum Speg. The cultures used in this 
€xperiment are one remove from stock tubes secured from the above 
mentioned dilution culture. All cultures were made on nutrient agar 
in slanting tubes, and every lot exposed to high temperatures was 
“ccompanied by checks at the room temperature. Since the checks 
“onstantly gave uniform growth, they are not included. Moreover, 
€xposed tubes in which growth had failed were constantly re-inoculated 
and tested at Toom temperatures, and in all cases growth resulted. 
tore a matin quantity of growth it is difficult, with such asco 
i. ea to make close comparisons in any case, and en MES y 
fre is no distinct line of growth, but only several isolated 
cen . ‘ 
ters. All Sowings were made as streak cultures with an abundance 
Spores 
_the 
In gener 
death at th 
' 7 
189g) smieenth Report of the State Entomologist of Illinois, S. A. Forbes, 1895-6. 
131 
