mately, 700 pounds of 95 percent alcohol, or 100 gallons of 95 percent alcohol per acre. In addition to the sugar in the form of sucrose, or common sugar, which the sweet potato contains, there is also an appreciable amount of non-crystallizable sugars. The total sugars in the sweet potato have not been overstated in the above estimate. In fact, the contrary, rather, is true, since the two sugars together probably average about six percent of the weight of the potato. If the average quantity of starch in the sweet potato is 20 percent, which is rather a low estimate, the total fermentable matter in the sweet potato is 26 percent instead of 25 percent, as estimated above.
Changes in Composition of the Sweet Potato of Different Varieties on Storing.[1]
First Lot (November 28).
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Name of Variety. | Original. | Air-dry. | Water-free.
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| Water. | Starch.| Invert |Sucrose.| Water. | Starch.| Invert |Sucrose.| Starch.| Invert |Sucrose.
| | | sugar. | | | | sugar. | | | sugar. |
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|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.
Georgia Buck | 75.35 | 13.13 | 0.77 | 4.31 | 6.79 | 49.65 | 2.93 | 16.31 | 53.27 | 3.14 | 17.50
Bunch Yam | 72.37 | 15.12 | 1.09 | 4.45 | 6.67 | 51.06 | 3.67 | 15.04 | 54.71 | 3.93 | 16.11
Do | 67.99 | 19.58 | .56 | 4.49 | 7.24 | 56.70 | 1.61 | 13.02 | 61.18 | 1.74 | 14.04
Horton Yam | 70.29 | 15.06 | 1.05 | 6.23 | 6.24 | 47.52 | 3.31 | 19.67 | 50.68 | 3.53 | 20.98
Georgia Buck | 71.56 | 14.35 | .73 | 6.61 | 6.88 | 46.98 | 2.40 | 21.63 | 50.45 | 2.58 | 13.23
Vineless Yam | 70.03 | 16.85 | .54 | 5.01 | 7.90 | 51.78 | 1.67 | 15.40 | 56.22 | 1.81 | 16.72
Hanover Yam | 76.16 | 13.61 | 1.10 | 4.22 | 7.37 | 52.89 | 4.29 | 16.40 | 57.10 | 4.63 | 17.70
Georgia Yam | 70.01 | 18.87 | 1.00 | 4.08 | 7.57 | 58.17 | 3.07 | 12.59 | 62.93 | 3.32 | 13.62
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Average | 71.72 | 15.82 | .86 | 4.93 | 7.08 | 51.84 | 2.87 | 16.26 | 55.82 | 3.09 | 16.16
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Second Lot (January 7).
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Name of Variety. | Original. | Air-dry. | Water-free.
+++++++++++
| Water. | Starch.| Invert |Sucrose.| Water. | Starch.| Invert |Sucrose.| Starch.| Invert |Sucrose.
| | | sugar. | | | | sugar. | | | sugar. |
-+++++++++++
|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.|Percent.
Georgia Buck | 69.74 | 12.72 | 1.75 | 9.25 | 8.80 | 38.34 | 5.27 | 27.87 | 42.04 | 5.78 | 30.56
Bunch Yam | 67.31 | 13.66 | 2.02 | 9.90 | 9.49 | 37.83 | 5.60 | 27.40 | 41.80 | 6.19 | 30.27
Do | 67.29 | 13.83 | 2.40 | 9.43 | 10.00 | 38.04 | 6.61 | 25.94 | 42.27 | 7.34 | 28.82
Horton Yam | 71.39 | 9.57 | 2.57 | 9.69 | 7.18 | 31.05 | 8.35 | 31.43 | 33.45 | 9.00 | 33.86
Georgia Buck | 67.63 | 14.43 | 2.12 | 7.85 | 8.46 | 40.80 | 6.00 | 22.21 | 44.57 | 6.55 | 24.26
Vineless Yam | 67.33 | 12.03 | 2.90 | 10.09 | 7.90 | 33.90 | 8.19 | 28.44 | 36.81 | 8.89 | 30.88
Hanover Yam | 70.13 | 14.13 | 1.66 | 6.58 | 9.29 | 42.90 | 5.05 | 19.99 | 47.29 | 5.57 | 22.04
Georgia Yam | 71.78 | 11.21 | 2.26 | 8.10 | 8.62 | 36.30 | 7.31 | 26.24 | 39.72 | 8.00 | 28.72
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Average | 69.08 | 12.70 | 2.21 | 8.86 | 8.72 | 37.40 | 6.55 | 26.19 | 40.99 | 7.17 | 28.68
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Effect of Storage on Composition.—Experiments have shown that the quantity of starch diminishes and the quantity of sugar increases on storing.
- ↑ South Carolina Agr. Exp. Sta., Bul. 63, p. 25.
