320 PRINCIPLES AND PRACTICE OF MILK HYGIENE 
and it is further advised that all milk produced at such dairy 
shall be heated at 145° F. for 40 minutes, or 155° F. for 30 
minutes, or 167° F. for 20 minutes, and immediately cooled to 
50° F. These facts should also be part of the notice, and such 
heating of the milk should be continued during the accepted 
period of incubation for such contagious disease. 
The following method of fumigation is recommended: 
After all windows and doors are closed and the cracks sealed 
by strips of paper applied with flour paste, and the various 
articles in the room so hung or placed as to be exposed on all 
sides, preparations should be made to generate formaldehyde 
gas by the use of 20 ounces of formaldehyde and 10 ounces of 
permanganate of potash for every 1000 cubic feet of space to 
be disinfected. 
For mixing the formaldehyde and potassium permanganate 
a large galvanized-iron pail or cylinder holding at least 20 
quarts and having a flared top should be used for mixing therein 
20 ounces of formaldehyde and 10 ounces of permanganate. A 
cylinder at least 5 feet high is suggested. The containers 
should be placed about in the rooms and the necessary quantity 
of permanganate weighed and placed in them. The formalde- 
hyde solution for each pail should then be measured into a 
wide-mouthed cup and placed by the pail in which it is to be 
used. 
Although the reaction takes place quickly, by making prep- 
arations as advised all of the pails can be “ set off ” promptly 
by one person, since there is nothing to do but pour the formalde- 
hyde solution over the permanganate. The rooms should be 
kept closed for four hours. As there is a slight danger of fire, 
the reaction should be watched through a window or the pails 
placed on a noninflammable surface. 
97. Following a weekly medical inspection of the employees, 
a monthly report shall be submitted to the secretary of the 
medical milk commission, on the same recurring date by the 
examining visiting physician, 
The following schedule, filled out in writing and signed by 
himself, is recommended as a suitable form for the attending 
physician’s report: 
