The middle site leaves of two kinds of flue-cured tobacco(K326 and G80) are studied when the leaves are no-, green, riped or overriped respectively. The amount of chloroplast was studied by olefin slice, and the content of chlorophyll of main nerve is studied by ketone, while the angle of stem to leaf is noted. It shows that the content of chlorophyll and the number of chloroplast debases with the maturing. K326 and G80 are r...