TABLE FOR CALCULATING STARCH IN POTATOES FROM SPECIFIC GRAVITY. 10000 grams of potatoes weigh in Per cent Per cent water. dry matter. starch. Grams. 750 19.9 14.1 760 20.1 14.3 770 20.3 14.5 780 20.7 14.9 790 20.9 15.1 800 21.2 15.4 810 21.4 15.6 820 21.6 15.8 830 22.0 16.2 840 22.2 16.4 850 22.4 16.6 860 22.7 16.9 870 22.9 17.1 880 23.1 17.3 890 23.5 17.7 900 23.7 17.9 910 24.0 18.2 920 24.2 18.4 930 24.6 18.8 940 24.8 19.0 950 25.0 19.2 960 25.2 19.4 970 25.5 19.7 980 25.9 20.1 990 26.1 20.3 1000 26.3 20.5 1010 26.5 20.7 1020 26.9 21.1 1030 27.2 21.4 1040 27.4 21.6 1050 27.6 21.8 1060 28.0 22.2 1070 28.3 22.5 1080 28.5 22.7 1090 28.7 22.9 1100 29.1 23.3 1110 29.3 23.5 1120 29.5 23.7 1130 29.8 24.0 1140 30.2 24.4 1150 30.4 24.6 1160 30.6 24.8 1170 31.0 25.0 1180 31.3 25.5 1190 31.5 25.7 1200 31.7 25.9 1210 32.1 26.3 1220 32.3 26.5 1230 32.5 26.7 1240 33.0 27.2 1250 33.2 27.4 1260 33.4 27.6 1270 33.6 27.8 1280 34.1 28.3 1290 34.3 28.5 1300 34.5 28.7 1310 34.9 29.1 1320 35.1 29.3 1330 35.4 29.6 1340 35.8 30.0 1350 36.0 30.2 1360 36.2 30.4 1370 36.6 30.8 =270. Constitution of Cellulose.=—The group of bodies known as cellulose comprises many members of essentially the same chemical constitution but of varying properties. The centesimal composition of pure cellulose is shown by the following numbers: Carbon, 44.2 per cent Hydrogen, 6.3 ” ” Oxygen, 49.5 ” ” corresponding to the formula C₆H₁₀H₅.