Sunflower plants were grown in sand culture with nutrient soln. One group had iron salt as ferric citrate added to the nutrient soln.; the other had no Fe salt added. The plants of the minus-Fe treatment developed the typical chlorosis of Fe deficiency; the controls were of normal color. Respiration rate was depressed in the young chlorotic leaves of the Fe-deficient plants. The chlorotic leaves of the Fe-deficient plants contained only half as much Fe as comparable leaves of control plants. No relocation of Fe from older to younger leaves occurred in the Fe-deficient plants. In both the gradients were of decreasing Fe content in going from the bottom to the top of the plants. The Fe contents of the leaves of a given plant of either treatment were found to be related to the ages of the leaves. The older contained more Fe than the younger leaves.