. The chemistry of plant and animal life. Agricultural chemistry. LABORATORY MANIPULATION 25 degree of accuracy the part of a test tube filled by 5 cc. Repeat the operation, using 10, 15, 20, and 25 cc. portions, until the eye has become reasonably fa- miliar with the approximate and relative amounts; so that, if at any time a graduate is not at hand, the amounts can be estimated with the eye accurately enough for practical purposes. 29. Obtaining Reagents from Bottles. — Take the bottle from the shelf, remove the stopper, holding it between the first and second fingers of the right or left ha
. The chemistry of plant and animal life. Agricultural chemistry. LABORATORY MANIPULATION 25 degree of accuracy the part of a test tube filled by 5 cc. Repeat the operation, using 10, 15, 20, and 25 cc. portions, until the eye has become reasonably fa- miliar with the approximate and relative amounts; so that, if at any time a graduate is not at hand, the amounts can be estimated with the eye accurately enough for practical purposes. 29. Obtaining Reagents from Bottles. — Take the bottle from the shelf, remove the stopper, holding it between the first and second fingers of the right or left hand (Fig. 7). Hold the test tube or vessel that is to receive the reagent in the other hand. Pour the liquid slowly until the de- sired amount is obtained. Because of danger of con- taminating the reagents, it is always better to pour the liquid slowly and secure the right amount at first rather than to pour back from the receiving vessel. Replace the test tube in the stand or receiver on the desk; then, before inserting the stopper, touch it to the neck of the bottle to catch the few drops on the edge, to prevent them from dripping down the sides of the bottle, and on to the shelf. Be sure to replace the bottle on the shelf in its proper place. Much annoyance and delay are caused by not returning the bottles to their proper places. 30. Filtering. — Place the funnel on the arm of the wooden stand. Fold a filter paper so as to make a semi-. Fig. 7. — Pouring liquid from Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Snyder, Harry, 1867-1927. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1913
