No abstract

Complete seasonal patterns of moisture content of the wood and bark of Betula lutea (which resembles other species of birch) and of Tsuga canadensis are given, along with those for sapwood and heartwood of Abies balsamea and Picea rubens. Incomplete seasonal data are also presented on the moisture content of the wood of Picea glauca and Thuja occidentalis.Minor variations in the water content pattern of yellow birch due to precipitation, evapotranspiration, and winter insolation are described. These variations, examined in the light of climatic data, lend little support to the view that birch dieback is due to an increase in temperature or to drought, except possibly through their effects on some unknown biotic factor.The practical aspects of tree water content studies are discussed with particular reference to the questions of flotation and sinkage of logs.

No abstract

Vol. 66 ness and the residue (A) fractionally distilled in the Cooke-Bower fractionating column26 a t 0.1 mm. pressure. About 20% (0.35 g.) of the starting material (A) was obtained as a yellow crystalline solid and after recrystallization from ether melted at 68-69'. A mixed melting point determination, with 1-(3,4-dimethoxyphenyl)-1,2-propanedione showed no depression. The remainder of the material was not identified.Reaction of 3-Chioro-l-(3,4-dimethoxyphenyl)-2-propanone (Series I) with a Mixture of Potassium Acetate and Glacial Acetic Acid.-The chloroketone (8.0 g.) was disiolved in glacial acetic acid (35 cc.), freshly-fused potassium acetate (21 g.) added, and the resulting solution heated for eight hours a t 90-100". The reaction mixture was diluted with water (300 cc.), neutralized with sodium carbonate, and extracted with chloroform. The extract was dried, the solvent removed and the residue fractionally distilled under reduced pressure. Each of the fractions obtained was semicrystalline. The crystalline material

No abstract