Organic analysis; a manual of the descriptive and analytical chemistry of certain carbon compounds in common use-- for the qualitative and quantitaive ... and pharmaceutical assays; the estimation of

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...to be 86.7 to 87.7 per cent.' Rancid Btttte-x give nearly the same percentages as fresh butters (fi.kischmann and Vietii), the slight differences being in the direction of an increase. (2) Interpretation of results by Beicherfs Estimatiun--The c.c. of decinormal alkali to neutralize the volatile acids of 2.5 grains of fat. Each c.c. decinormal alkali indicates 0.0088 grain of butyric acid; and 0.0088 gram butyric acid in 2.5 grams of fat is equal to 0.00352 gram butyric acid in 1 gram of fat. or 0.352 in 100 grams of fat. Then, Reichert's number X 0.352--per cent, of volatile acids (as butyric acid) in the fat; and per cent, butyric acid 0.352 = Reichert's number. Reichert found true butters to give numbers from 13.55 to 1-1.45, average 14.0, and declared any butter giving less than 12.0 c.c. must be adulterated. Dr. (jr. C. Cai.dwell reported-to New York State Board of Health estimations of 27 samples of butter yielding Keichert's numbers from 12. 7 to 15.5. Messrs. Wallkr and Mabtin (Report Xew York State Dairy Commissioner, 1S86) obtain, from 26 American butters, on first 50 c.c. of distillate, numbers of Reichert's method from 12.2 to 16.3 as extremes. They also carried eight additional distillates, in extension of Meissl's plan, by which they compute that only from 75 to 85 per cent, of the total volatile acid comes over in the first 50 c.c. Prof. C. B. Cochran, West Chester, Pa., Food Inspector of 11884: p. 63, Report of the Chemist, H. V. Wiley. 1 Unpublished report communicated to the author. Directions fur estimation and hililiography, p. 253. the Pennsylvania Board of Agriculture,1 has found the extreme minimum of the Reichert's numbers of known genuine butters to be 12.5 (c.c. of tenth-normal sol. for 2£ grains fat); and this...