ClipArt ETC
"Diagram illustrating the descent of food from the leaf into the stem, and its circulation upward and downward through the sieve tubes, and upward through the tracheal tissues." -Stevens, 1916

Leaf Food Circulation

"Diagram illustrating the descent of food from the leaf into the stem, and its circulation upward and…

"Showing the effect of cutting across the veins on the removal of food from the leaf. A, all of the main veins are cut across near their bases; B, the mid-vein alone has been severed. The stippled areas indicated the starch reaction with the iodine test." -Stevens, 1916

Cut Leaf Veins

"Showing the effect of cutting across the veins on the removal of food from the leaf. A, all of the…

"Diagram indicating the succession of the conducting tissues of a vein from the base toward the apex. a, border parenchyma; b, companion cells; c, sieve tubes; d, undivided mother cells of companion cells and sieve tubes; e, tracheal elements." -Stevens, 1916

Plant Vein

"Diagram indicating the succession of the conducting tissues of a vein from the base toward the apex.…