CHLOROPHYLL (from Gr. XAwpos,

See also:

• GREEN, A
• GREEN, ALEXANDER HENRY (1832—1896)
• GREEN, DUFF (1791—1875)
• GREEN, JOHN RICHARD (1837—1883)
• GREEN, MATTHEW (1696-1737)
• GREEN, THOMAS HILL (1836-1882)
• GREEN, VALENTINE (1739–1813)
• GREEN, WILLIAM HENRY (.1825–1900)

green, 4bXXov, a

See also:

• LEAF (O. Eng. leaf, cf. Dutch loof, Ger. Laub, Swed. lof, &c.; possibly to be referred to the root seen in Gr. Ma-eta, to peel, strip)

leaf)  , the green colouring matter of leaves . It is universally present in growing vegetable cells . The pigment of leaves is a complex mixture of substances; of these one is green, and to this the name, originally given in 1817 by Pelletier and Caventou, is sometimes restricted; xanthophyll (Gr . EcvOos, yellow) is dark brown; carotin is copper-coloured . Chlorophyll is related chemically to the proteids; a decomposition product, phylloporphyrin, being very closely related to haematoporphyrin, which is a decomposition product of haemoglobin, the red colouring matter of the blood . Chlorophyll is neutral in reaction, insoluble in water, but soluble in alcohol, ether, &c., the solutions exhibiting a green colour and a vivid red fluorescence . Magnesium is a necessary constituent . (See S . B . Schryver, Science Progress, 1909, 3, P .