50 IOWA ACADEMY OF SCIENCE 



(11) Kerp & Unger, Ber. 30, 590 (1897). 



(12) Conrad & Reinbach, Ber. 34, 1339 (1901). 



(13) Unger & Jager, Ber. 35, 4440 (1902); 36, 1222, (1903). 



(14) Fromherz, Z. physiol. Chem. 50, 241 (1910). 



(15) Fallada, Stein & Ravinka, Oesterr. ung. Z. Zuckerind 43, 425. 



(16) Michael, J. prakt. Chem. 35, 456 (1887). 



(17) Michael, J. prakt. Chem. 49, 37 (1894). 



(18) Gabriel & Colmann, Ber. 37, 3657 (1904). 



(19) Traube, Ber. 26, 2553 (1893). 



(20) Fischer & Dilthey, Ann. 335, 350 (1904). 



Chemical Section, 



Iowa Agricultural Experiment Station. 



