Abstract
Resistive varieties seemed to have shorter culms, thicker tracheas, and wider leaves in proportion to the length of the leafblade, than sensitive varieties .in the resistive varieties, the leafblade area per unit weight of water contained in the tissue, the number of stomatas per unit area, and consequently the number of stomatas per unit weight of water contained were smaller than those in sensitive varieties. When the stem which had been cut off below the top-leaf was inserted in bottle containing water and leaved in-door over night, the degree of leafrolling in resistive varieties was very slight compared with sensitive varieties.
