1. The cork-bark of “Abemaki” ( Quercus variabilis ) was analyzed with the usual method employed for the analysis of wood. 2. Suberin was determined with the method proposed by Zetzsche. 3. Due to the presence of suberin in cork, the Cross-Bevan method and the 72% sulphuric acie method gave the unproperly high value at the determination of cellulose and lignin, respectively. 4. For the determination of cellulose of cork, the method, at which the sample is treated alcoholic-nitric acid solution and then treated with alcoholic-potassium hydroxide solution, may be applicable. 5. The extraneous components of cork were divided into groups of chemically similar substances. Yield and some properties of the each fraction were examined.