The fireside university of modern invention, discovery, industry and art for home circle study and entertainment . farmers paid for their milk ? By the hundredweight—something like 70 cents for standardmilk. The commonest adulterations are water,starch and yellow colors, such as the yolks of eggs,carrots and even metallic keep milk from showing its age,boric and salicylic acids, soda, andother chemicals areadded. Methodshave been adopted which discoverall these practices. To find thewater a gravity tube is sunk in themilk. If a vessel holding a thousandpounds of water be filled with
The fireside university of modern invention, discovery, industry and art for home circle study and entertainment . farmers paid for their milk ? By the hundredweight—something like 70 cents for standardmilk. The commonest adulterations are water,starch and yellow colors, such as the yolks of eggs,carrots and even metallic keep milk from showing its age,boric and salicylic acids, soda, andother chemicals areadded. Methodshave been adopted which discoverall these practices. To find thewater a gravity tube is sunk in themilk. If a vessel holding a thousandpounds of water be filled with goodmilk it must weigh from one thou-sand and twenty-eight to one thou-sand and thirty-five pounds—bothwater and milk at 60 degrees oftemperature. Suppose we weight-ed a closed glass tube with iron ormercury and let it stand upright inthe water. Now mark the water line1,000. Sink the same tube in ordinary milk, and the tube will notgo down to the water mark. Mark the milk-line, say 1031, andgrade the space between the two lines into thirty-one equalparts. This tube would then be a lactometer, If the milk. Fig. 59. SOXHLETS APPARATUSFOB DETERMINING FAT IN MILK. 136 THE FIRESIDE UNIVERSITY. shows less than 1028, it is certainly watered. If it goes over1035, cream or another heavy body from outside sources has beenadded. About per cent, of good milk is water. To findstarch, tincture of iodine is introduced, which colors the starchcells blue. If there is dextrine in the milk, it will turn red. Ifthe milk-tester discovers a can of milk that does not hold up tothe lactometer properly, he can then proceed further. Wlicit is Professor Bab cocks sulphuric acid centrifugalmachine ? This is in reality a cream separator into which sulphuric acidhas been put along with the milk to be tested. What is desired is to know the proportion of fat to themilk. Milk, besides its per , is composed of fat, sugar,caseine (that is cJieese-ine) and sulphuric acid destroy
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