โ Scribed by J.S.H.
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tural Experiment Station at Geneva states in Bulletin 478 of that station that at least 5 ยฐ to 75 per cent. of the soils of that state would be distinctly benefited by the addition of suitable basic material. The following substances are used for this purpose: Burned lime, hydrated lime, ground limestone, and lime byproducts; usually the most economical is a good grade of ground limestone with a calcium carbonate equivalent of over 9 ยฐ per cent. If ground limestone be applied at the rate of 50o to IOOO pounds per acre, it should all pass a 4o-mesh screen ; if applied at the rate of 2 or more tons per acre, it need only pass a Io-mesh screen. The smaller amount should be applied yearly, while the heavier treatment is required but once every three to five years. Magnesium limestone may be used for agricultural purposes. Limestone screenings and crusher dust (a by-product in the manufacture of crushed stone) frequently are a fair grade, cheap material suitable for use in liming soils.
J. S. H.
Alcohol as a Motor Fuel.mPreliminary researches by H. B.
Dixon on the use of alcohol as a motor fuel are described in Jour. Soe. Chem. Ind., 192o , xxxix, Review, 355. Alcohol was found to
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