. Effective farming; a text-book for American schools . Fig. 155. — A dipper made entirely of glass and holding cubic centimeters for measuring the acid. with glass stoppers. In making a test, these directions should be followed: Mix thoroughly the sample to be tested, place the pipette in the milk, and suck milk into the tube until it is above the level of the etched line on the neck. Place the forefinger over the end of the pipette and the milk will remain in the tube. Re- move the pressure of the finger slightly and allow the milk to run out of the end of the pipette until it is on a l
. Effective farming; a text-book for American schools . Fig. 155. — A dipper made entirely of glass and holding cubic centimeters for measuring the acid. with glass stoppers. In making a test, these directions should be followed: Mix thoroughly the sample to be tested, place the pipette in the milk, and suck milk into the tube until it is above the level of the etched line on the neck. Place the forefinger over the end of the pipette and the milk will remain in the tube. Re- move the pressure of the finger slightly and allow the milk to run out of the end of the pipette until it is on a level with the etched line, thus leaving of milk in the pipette. Place the end of the pipette in the neck of the test bottle and allow the milk to flow into the bottle. Fig. 159 shows the correct way to hold the bottle and the pipette. If they are both held in a vertical position the milk is almost sure to spill (Fig. 160). Next, fill the acid measure with acid ( ) and Aa/| pour it into the test bottle. Slant Tiu the bottle as before. If the acid has been poured into the milk carefully, the two liquids will be in two layers Mix the acid and uring the milk by gently rotating the bottle. Continue this rotating until all pieces Fig. 157.—Acom- of curd that form in the mixture are dissolved. ^^??^ ^°**^^ ^"^^ • n ,, . 1 r. , acid measure. Allow the mixture to stand a few minutes, then rotate the bottle again for a short time. Place the bottles in the tester in an upright position. The tester should be full of Fig. 156. iT^lll in the bottle.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
