46 
temperature of 38|° Cent. July 10, no growth; ^temperature 39 h 
July 11, no growth; temperature ?>1\ . July 15, no traces of the 
white fungus seen. Failure of growth due probably to high tem¬ 
perature maintained. 
No. 36. July 28. Infection experiment on 100 cabbage worms 
( P. rcipcv) with spores of the white muscardine from Nos. 32, 41, 
50, and 73. The caterpillars were placed after infection upon a 
growing cabbage outdoors, and this was afterwards covered^ with 
mosquito netting. July 30, no traces of fungus seen. Worms 
climbing up sides of cage preparatory to pupation. Parasitic 
Hymenoptera attacking them freely. July 31, one dead worm re¬ 
moved and placed on damp sand for further development. August 
3, several larvae dead on the side of the cage and one on the 
ground. The latter was examined and its body cavity was found 
to contaiu tiaces of the mycelium of muscardine. August 4, twenty- 
six pupae, seven larvae that had partly cast the last larval skin,, 
and twenty other larvae of this lot, all dead, were placed on damp 
sand in the insectary. Cocoons of hymenopterous parasites were 
very abundant under the netting and it is quite likely that a 
large part of the worms were killed by insect parasitism. One dead 
worm examined contained traces of Sporotrichum in the body cav¬ 
ity. August 5, a number of hymenopterous parasites have emerged 
from pupae on sand in the insectary. August 6, two larvae and 
one pupa show an external growth of Sporotrichum and more para¬ 
sitic Hymenoptera have emerged. Seven more dead larvae and five 
pupae placed on sand. August 7, two more dead larva 
placed on sand; parasites still emerging. August 10, the larva 
placed ou damp sand July 31 now bears a profuse growth of fruit¬ 
ing Sporotrichum. Twenty-two other larvae ou saud show an exter¬ 
nal mvcelial growth. Eight more dead larvae aucl eight pupae re¬ 
moved from cage and placed on sand. August 11, eleven larva- 
and two pupae imbedded in the white fungus removed and placed 
in vial for future use. More hymenopterous parasites have 
emerged. Nothing of importance recorded from August 13 to 
16. On the 17th six larvae and nine pupae covered with Sporo¬ 
trichum were removed from the sand and placed in a viah August 
19, rain last night and to-day. One larva lying on the ground 
dead with the fungus taken from the outdoor cage.^ August 22 r 
two more larvae and three pupae show slight tufts of Sporotrichum 
on their bodies. Experiment closed. 
One hundred cabbage worms were placed in an outdoor cage 
similar to the foregoing July 9, and kept as a check. August 4, 
larvae all right except for hymen opterous parasites. August 13, two 
pupae dead with bacterial disease, others in good condition except 
for parasites. The cage remained in good condition and at no 
time were any traces of Sporo trichum found in it. For similar 
experiment see No. 69. 
No. 37. July 28. Infection experiment upon fall web-worms 
(Hyphantria textor) infected with fungus spores from Nos. 31, 
32, and 68. About two hund red web-worms were taken from their 
nest, dusted with spores of white fungus and placed in a breeding- 
