Chlorophyl

(kla’-ro-Jil) [x/jupoc, green; o\ /./ lot. leaf]. The green coloring-matter of plants. It decomposes carbon dioxid, setting free oxvgen, and forming new organic compounds. This decomposition takes place only or chiefly in the presence of sun-light. The chlorophyl is contained in certain parts of the protoplasm of the plant It is the substance by the agency of which carbohydrates are formed in green plants. 189