Profitable dairying; a manual for farmers, dairymen and students . nd then only after a thorough stirring. If a small sample is to be tested this too must be thoroughlymixed before the final sample is taken in the pipette. If more thanone test is to be made from the same sample the sample should bemixed each time before being drawn into the pipette. Thoroughmixing is the most important part of sampling, and good samplingis one of the most important points to be observed in making acorrect test. 2. Filling the Test Bottle: When the sample has been thoroughly mixed the milk should bedrawn into t
Profitable dairying; a manual for farmers, dairymen and students . nd then only after a thorough stirring. If a small sample is to be tested this too must be thoroughlymixed before the final sample is taken in the pipette. If more thanone test is to be made from the same sample the sample should bemixed each time before being drawn into the pipette. Thoroughmixing is the most important part of sampling, and good samplingis one of the most important points to be observed in making acorrect test. 2. Filling the Test Bottle: When the sample has been thoroughly mixed the milk should bedrawn into the pipette by suction with the mouth until it rises abovethe mark on the stem. The forefinger of the hand in which the pipetteis held is then quickly placed on top of the pipette and the milk isallowed to run down to the mark where it is checked and held bythe forefinger. The test bottle is taken in the other hand, slightlyinclined, the filled pipette introduced in the neck, the finger is removedand the milk allowed to run down the side of the neck into the test. By slowly releasing the pressure of the finger at the top of the pipette, the milk runs without infn tlip tp^i hnttip loss, into the test bottle 29 PROFITABLE DAIRYING bottle. Great care should be used not to lose any of the sample; evenif only a few drops are spilled the test is spoiled and another sampleshould be taken. 3. Adding the Acid: Ordinary commercial sulphuric acid at a specific gravity of should be used. It may be purchased at any drug store forthree or four cents per pound. A better place, however, to obtainthe acid is from some creamery or cheese factory. These factoriesuse large quantities of it and usually are glad to supply parties wantingsmall quantities. It is poisonous and must not be allowed tocome in contact with the skin, hands, clothing or tin or iron by accident any should be spilled, it should be washed off im-mediately, using plenty of water. An application of diluted a
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