Changes in the chemical composition of a cambial cell during its differentiation into xylem and phloem tissue in trees. 2. Carbohydrate constituents of each main component

DIFFERENTIATION OF A CAMBIAL CELL. 1 455 (Table A single cell in any region of the gymno- sperm was five times greater in weight than in the corresponding regions in the angiosperms and con- tained proportionally smaller percentages of ash, protein and phosphorus. In the xylem of the ash, the amount of water (30 % of the fresh weight) was much smaller than in the xylem of the other trees; Allsopp & SUMMARY 1. A quantitative determination has been made of the changes that occurred in the composition of a cambial cell during its differentiation and sub- sequent maturation in four species of tree, Acer psefdoplatanu8, Betula platyphylla, Fraxinus elatior and Pirnus ponderosa.