
FUNGI IN CHEESE RIPENING. aig 
days showed digestion by seven of these species. Five of 
them appeared to digest milk at least twice as rapidly as that 
species, in the first week. 
In another series, milk agar was made by dissolving one to 
two per cent. of the agar in water at'130° C. and pouring 
together equal quantities of the hot agar and hot sterilized 
milk. If poured into petri dishes at once this medium was 
smooth and clear, but if acidified or sterilized after mixing, 
flakes of precipitate appeared. The flaky precipitate in the 
acidified cultures was found very useful as an indication of 
digestion. In cultures upon the surface of such plates where 
digestive action was strong, the flakes would entirely disappear. 
Twenty-three species of mold were tested upon milk agar in 
this way. Of these, eight produced a distinctly stronger diges- 
tion than the Camembert Penicillium; five produced digestion 
approximately equalling that species, and ten produced less 
digestion. 
both results in all but two cases agreed fully. 
‘These cultures were mostly made in duplicate and 
‘Oidium lactis 
produced comparatively little effect upon this medium. 
TABLE 11.—Reactions of Certain Spectes. 






2 | Liquid Digestion | Digestion | Growth at 
Ditmas. | Cue of Curd. of Milk. to Io euagaen 
fred theat..1 ; 2 i / Mea gh 
Gamenmibert,.> |'+ | partial medium | medium slow fruiting 
Pon spite | | 
Roquefort, - | blue softening | rapid rapid | characteristic 
Oidium, - - | blue incomplete | slow _ slow characteristic 
Mucor 12, - | blue _incomplete | slow a poor 
Mucor Igt, | blue incomplete | slow a | nae 
oO ge sts. _ blue rapid aoe rapid — 
| | e : 
2G wede i =.) DIGE | partial rane rapid | retarded 
| pe uO ue elight medium at o 
132, - ~ ~ |? slowly blue | 
Braeeee ot Moss | slight slow tO | slight | slow 
GG. ac 625 - F i eee partial slow medium | slow fruiting 
Monilia 4 | ; 
candida | blue rapid rapid rapid | — 
No. 198, 
P. brevicaule,| blue rapid rapid | rapid | — 
392, - - - | blue rapid slight | rather slow — 
240, - - - | blue rapid rapid — | pts 
Aspergillus are (Paar 8 oe eo 
: | pi slow 
niger, - 
135, - - -} blue rapid ) — rapid — 
( red to pur- partial ; oe sae 
136). -'.-.)- ]ple blue softening | medium characteristic 





