The Methylation of purified non-cellulosic polysaccharide was done by Partial and Drastic methylation. The Partial methylation of hemicelluloses was carried out using improved Haworth method and Drastic methylation by Purdic method. The completely methylated products of hemicelluloses were hydrolysed into their constituents methylated sugar components using methanolic hydrogen chloride. The RG value and Molar ratio of methylated hydrolysates also determined volumetrically as well as by paper chromatographic technique. Various data obtained from the above investigations made it possible to determine the chemical nature and structure of hemicellulose.