. Preventive medicine and hygiene. ian. Almost all countries prohibit the use of such foreign only proper preservatives for milk are cleanliness and cold. Dirty Milk—Tlie Dirt Test.—Practically all milk contains more or MILK 569 less dirt. For the most part, this dirt consists of cow feces. The pres-ence of dirt may best be determined by filtering a pint of milk tlirougha little disk of absorbent cotton. This produces a stain varying in inten-sity from a yellowish to a brownish or black spot. A Gooch crucible,a Lorenz apparatus, or simply an ordinary funnel may be used to filter
. Preventive medicine and hygiene. ian. Almost all countries prohibit the use of such foreign only proper preservatives for milk are cleanliness and cold. Dirty Milk—Tlie Dirt Test.—Practically all milk contains more or MILK 569 less dirt. For the most part, this dirt consists of cow feces. The pres-ence of dirt may best be determined by filtering a pint of milk tlirougha little disk of absorbent cotton. This produces a stain varying in inten-sity from a yellowish to a brownish or black spot. A Gooch crucible,a Lorenz apparatus, or simply an ordinary funnel may be used to filterthe milk. Warm milk filters much more readily than cold milk. Thissimple test is one of the most practical of the routine tests used for the]ni))lic health control of milk supplies. The intensity of the stain andthe amount of deposit upon the cotton is a tell-tale which appeals stronglyto farmers and dairymen, as well as to consumers. It is a good practiceto send these disks of cotton, with a letter, to the farmer, showing him. Fig. 72.—Conditions under Which It Is Difficult to Cleanse and DisinfectMilk Bottles and Milk Pails. the amount of dirt contained in his milk. The disks may be dried andkept with the records of the health office. It should be remembered that milk that has been clarified orstrained will not show the dirt test. Bacteria in Milk.—As a rule, milk contains relatively and actuallymore bacteria than any other article of diet. Milk may, in fact, con-tain more bacteria than any other known substance; it frequently con-tains many more bacteria than are found in sewage. Mere numbers,however, need not alarm us, for it is the kind that most concerns universal consent, however, milk containing an excessive numberof miscellaneous bacteria is not suitable for infant feeding. Were milka transparent food the enormous growth of microorganisms present inaverage market milk would be plainly visible to the naked eye. The bacteria get into the milk from a number
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Keywords: ., bookauthorwh, bookcentury1900, bookdecade1910, booksubjecthygiene
