Page:The story of milk.djvu/39

 owners of fine herds submitted their cows to the test, a reaction to which, under ill-advised regulations, permitted state officials to condemn the infected herds. In Denmark Dr. Bernhard Bang introduced a system of isolation of the infected animals which together with ''Compulsory Pasteurization'' of the milk from such cows has proved efficient for the eradication of tuberculosis, and the Bang Method is now generally recognized as the proper way of handling the matter.

Dr. Bernhard Bang of Copenhagen, Denmark

COMPOSITION OF COW'S MILK

Cow's milk contains on an average in 100 lbs.:

87   lbs. of water 4     "   " butter-fat 3¼    "   " casein and albumin (protein) 5     "   " milk sugar ¾    "   " ash (mineral matter) - 100 lbs. total.

It consists therefore of 87% water and 13% "solids," 4 of which are fat and 9, "solids—not fat."

Butter-Fat is found in milk in the form of minute globules suspended in the liquid. As fat or oil is lighter than water (has less specific gravity) it naturally floats and the fat globules therefore soon rise to the top when milk stands at rest, forming a layer of cream which may be skimmed off from the milk. In chemical composition butter-fat is very nearly the same as other