. Dairy chemistry; a practical handbook for dairy chemists and others having control of dairies. Dairy products. MILK-SIOAR POLARISCOPE. 155 Wiley's —The investigations of Wiley have shown that mercury compounds are the most efficient for this purpose, of which " acid mercuric nitrate " is the most convenient. This is prepared as follows :—Mercury is dissolved in twice its weight of nitric acid of specific gravity 142, and, after solution, an equal bulk of water is added. Basic lead acetate has also been used to remove fat and protein, but Wiley has proved that the results ar
. Dairy chemistry; a practical handbook for dairy chemists and others having control of dairies. Dairy products. MILK-SIOAR POLARISCOPE. 155 Wiley's —The investigations of Wiley have shown that mercury compounds are the most efficient for this purpose, of which " acid mercuric nitrate " is the most convenient. This is prepared as follows :—Mercury is dissolved in twice its weight of nitric acid of specific gravity 142, and, after solution, an equal bulk of water is added. Basic lead acetate has also been used to remove fat and protein, but Wiley has proved that the results are not accurate, owing to the incomplete removal of protein. Still more inaccurate is the use of acetic acid, followed by boiling, which has been recom- mended bv Blvth. E! 7. Fig. 22.—Polariscope. Wiley-Ewell Method.—Wiley and Ewell give the following method as the best for estimating milk-sugar by the polariscope :— They used a Schmidt & Haensch polarimeter, with which 200 millimetres of a solution of 32-91 grammes of milk-sugar in 100 read 100 divisions of the scale. They take 65-82 grammes of milk, add 10 of acid mercuric nitrate solution (in this case the solution of mercury in nitric acid is diluted with 5 volumes of water), and dilute to 100 A similar quantity of milk is taken, 10 of acid mercuric nitrate added and diluted to 200 Each of these solutions is mixed well, filtered, and polarised in a 400 mm. 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 Richmond, Henry Droop. London : Charles Griffin & co. , ltd.
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