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Caption: Board of Trustees Minutes - 1880
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121 The following were the results obtained: Composition of Ash.— Silica .Iron oxide Phosphoric acid. .. Manganese oxide Lime Magnesia Sulphuric acid Potassa Soda Sodium chloride 27.91 0.14 5.37 0.89 6.82 4.64 6.23 46.48 0.98 0.42 99.89 ANALYSIS OF SORGHUM S E E D . A sufficient quantity of the seed were ground as fine as possible in an iron mortar, and were preserved in a glass-stoppered bottle. The following portions of the ground seed were taken: 10 grains, for the estimation of sugar, dextrine, starch and fiber. 1 grain, " " water and ash. 1 •' " " albuminoids. 1 " " " oil. 1 " " " tannin. Sugar, Etc.—The ten grains reserved for sugar, etc., were rubbed up thoroughly with water in a mortar, then transferred to a filter and washed well with water. Solution=A. Kesidue=B. The solution, A, was concentrated to about 10 c.c. in a porcelain dish on a water bath, then transferred into a strong prescription bottle and washed with about 10 c.c. of water, and the washings added. 5 c.c. of normal sulphuric acid were added, the bottle closed with a rubber stopper, securely tied. The bottle and its contents were then transferred to a salt bath and boiled for six hours. After cooling, the contents of the bottle were transferred to a graduated cylinder, neutralized and diluted to 100 c.c, the coloring matter precipitated with acetate of lead, and, after thoroughly mixing, the whole was allowed to stand until the precipitate had settled to the bottom. A portion of the clear liquid was then transferred to a barette and dropped into 10 c.c. of Fehling's solution, diluted four times, and at the boiling temperature, until the whole of the copper had been precipitated as cuprous oxide. This point was determined by filtering a small quantity from time to time, acidifying the filtrate with acetic acid, and testing for copper with ferro-cyanide of potassium. The number of c.c. of the sugar solution it took was noted, and the sugar and dextrine determined by the following proportions :
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