581.1072 L Loomis, Walter Earl, 1898- Methods inplant physicology; a laboratory manual and research handbook, by Walter E. Loomis... and Charles A. Shull... with a chapter on statiscal methods by George W. Snedecor... 1st. ed. New York and London, mc. Graw-Hill book company, inc. 1937. xviii, 472 p. ilus. diagrs. 23 cm.