Abstract
The weight percent and absolute weight of pectic acid, instead of pectic substance, in lint during the growing process of cotton fiber were daily measured in order to make clear the distribution of pectic substance in cotton fiber. From this series of experiments, it may be concluded that the pectic substance is also the surface constituents of cotton fiber and exists only in the primary wall of the cotton fiber and can not be found in appreciable amount in the inner structure of cotton fiber, i. e. the secondary wall of cotton fiber. The pectate content in cotton fiber is directry proporional to the content of wax, surface constitutents of cotton fiber, and is also constituents of the primary wall. The relationships between pectic substance and the formation of cellulose is also discussed.
