To summarize: by the results obtained, we would say that essentially the work of Czapek was checked and slightly extended. The work of Hoffmeister could not be duplicated as to yield just as have other investigators had difficulty in doing. The existence of his two percent yield of claimed product has yet to be proven. The work of Grafe could not be completely checked and only two of his suggested products were found. The third was not. After some difficulty, coniferyl aldehyde was synthesized by Pauly and Wascher's method. Much work was done in an attempt to obtain crystalline material in quantity. This failed. For this reason, color tests were made and compared. A great number of new reagents were tried for color production. A few were successful. In view of the experimental data, we may draw the following conclusions: (1) "Hadromal" obtained by Czapek's method is, as he suggested, coniferyl aldehyde. (2) Grafe's "hadromal" at least contains furfurol, methyl furfurol, and vanillin. (3) A new color reagent was found, namely 2,4 dinitrophenyl-hydrazine. (4) The divergent results of Grafe and Czapek are due to a difference in method of extraction. (5) In general, the same type of product is obtained using spruce, oak, or maple sawdust. (6) Pauly and Wäscher's synthesis of coniferyl aldehyde will work. / M.S.