52 REeporRT OF THE BACTERIOLOGIST OF THE 
this way. However, the appearance of Bacillus rudensis in the 
milk at such irregular intervals and at times in such quantities 
has led us to look for seed beds at the dairy from which occ¢a- 
sionally the milk receives a heavy inoculation. 
CONCLUSIONS AND RECOMMENDATIONS. 
As the result of our experience during the past two seasons 
we feel assured that under all but very exceptional circumstances 
thorough steaming at the factory will control the rusty spots and 
keep them below the point where they will cause financial loss. 
_Just as is the case with the spraying of fruit or vegetables, the 
success attained will depend largely upon how thoroughly the 
directions are followed. 
In attempting to combat this trouble in any factory the first 
step is a thorough cleaning up of the factory and its surround- 
ings. A few loads of gravel will do away with the mud by the 
weigh can and the whey tank, and good drainage should be pro- 
vided for the factory waste. The walls and ceiling of the room 
in which the cheese is made should be cleaned and preferably 
whitewashed and the fioor scrubbed with hot lye. 
The weigh can and all the utensils which come in contact with 
the milk should be steamed thoroughly three times per week. 
This can be best accomplished by placing the utensils in a vat, 
drawing a heavy canvas cover tightly over the top and turning 
in the steam. In five minutes the heat should be up to 180° F. in 
all parts of the vat, and fifteen minutes more above this tem- 
perature will suffice. The weigh can is best treated by inverting 
and turning in the steam for twenty minutes through the faucet. 
The heating of the all metal cheese hoops can be carried out 
according to the same plan, but Frasier hoops present some 
difficulties. The accumulation of fat in the crevices makes a 
special place for heating desirable, and our experience in heating 
the wooden followers is not sufficient to justify us in recom- 
mending it as a regular procedure, although heating occasionally 
does not seem to be harmful. The cbservations given in con- 
nection with Factory Number Four indicate that heating these 
followers is desirable. 
