Theophylline-9-B-Dglucopyranosyl-~-monophosphate has been isolated and characterized for the first time from a natural source by spectroscopic and chemical methods; Arabinogalactan-proteins, identified as jMectins by their precipitation with j?-glucosyl Yariv antigen, were isolated from the dry seeds, stratified seeds, 2-week-old seedlings, 2-month-old seedlings, 2-year-old saplings, and lmonth-old callus of loblolly pine and Douglas fir. Two-way analyses of variance revealed that certain fi-lectin parameters differed significantly from one another depending on the species and developmental state of a sample's origin.