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(65) (66) (67) (68) (69) ~. (70) (71)
RUBBER: NEWER DEVELOPMENTS
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Ind. Eng. Chem., 21,126 (1929). SHEPPARD, NIETZ,and KEENAN, KELLY.in B E D F ~ Rand O WINKELMANN'S "Systematic Survey of Ruhber Chemistry," Chemical Catalog Co., New York City, 1923, pp. 53-73. Luaa, "The Chemistry of Ruhber," D. Van Nostrand, Inc., New York City, 1924, p. 103. BACON, J. P h y ~ Chem., . 32, 801 (1928). SEBRELL. in BEDFORD and WINRELMANN'S "Systematic survey of Rubber Chemistry," Chemical Catalog Co., New York City, 1923, pp. 23-52. DmMORE and V o c ~ ,Trans. Inrt. Rubber Ind., 4, 85 (1928). Ind. Eng. Chem., 17,393 (1925). GEERand BEDP~RD, BAYERAND Co., Ger. pat. 250,920; 255.680 (1911). GEER,India Rubber World, 55, 127 (1916). GEERand EVANS, ibid., 64, 887 (1921). CADWELL, Znd. Eng. Chem., 21,1017 (1929). BIERERand DAVIS,Ind. Eng. Chem., 16,711 (1924). Recent Economic Changes in the U. S., Vol. I (1929). GEER,U. S. pat. 1,617.588 (1927). India Rubber World, 82, 70 (May, 1930). Rubber Age (N. Y.), 21, 553 (1927). KAYE,I d a Rubber J., 64,435 (1922). Zndk Rubber World, 82, 69 (Aug., 1930). Ibid.. 82, 67 (Aug.. 1930). Automobile Topics, 94, 300 (1929). HAUSERand ~ O ~ L India D , Rubber J., 74,700 (1927); India Rubber World, 75, 315 (1927); Brit. pat. 293,771 (1927). India Rubber World, 75, 135 (1926). HAUSER,"Latex," trans. by KELLY,Chemical Catalog Co., New York City, 1930.. D. . 141. SCHIDR~WIT~ and G ~ L D S B R ~ UDutch O H , pat. 3518. HOPKIN~ONahd GIBBONS.U. S. Dat. 1.542.388 (1925): . . . India Rubber World. 78, 59 (Aug., 1928); Indie R d b b Rm., 28, 48 (1928). S H E P P ~ and D EBERLIN, Ind. Eng. Chem., 17, 711 (1925). SHEPPARD, Rubber Age (N. Y.), 21, 76 (1927). KLEIN,Rubber Age (N. Y.), 24,319 (1924).
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Strange Parasitic Plant M a y Be Good Food Source. A plant with flowers hut no leaves, that gets most of its food by tapping the roots of other plants and grows to be ten or twenty times as heavy as its host, yet without causing the latter any apparent injury, was described before a recent meeting of the National Academy of Sciences by Walter T . Swingle of the U. S. Department of Agriculture. It has the further distinction of being good for human food, and of maturing a good crop on as little as three inches of rain a year-believed t o be a record for food plants possible in dry regions. I t was originally discovered about eighty years ago in the desert near the CaliforniaMexico boundary, but until a little over a year ago remained a great rarity. Now, however, i t has been rediscovered in great abundance, and has received its first thorough botanical study. The part used for food is the thick, fleshy root, in which the plant stores water and a reserve of food material. The original discoverers found the Papago Indians using it for food, and when they tried i t roasted over a fire they found it very good. Mr. Swingle suggested that inasmuch as no other useful plant can he induced to grow in this arid region, it might be worth the white man's time t o follow the lead of the Indian on a larger scale.-Sience Senn'ce
