=Carbon dioxide=, _n._ A heavy gas, found as an impurity in the air. It is breathed out by animals and plants, and absorbed and used as a food by plants. =Castor oil=, _n._ The oil obtained from the seeds of the castor-oil plant. Used as a medicine and also in dyeing cotton certain colors. =Cell=, _n._ L. _cella_, a small room; a case or cup in which something is held, as anther cell, ovary cell, honeycomb cell; also the protoplasmic particles of which plants and animals are built up. =Candelabrum=, _n._ L. _candela_, a candle; a candle stick; any branched candlestick. A candelabrum rests on a post, while a chandelier is suspended. Candelabra is the plural. =Chasm=, _n._ From a Greek word meaning “a yawning hollow”; a wide, deep cleft. =Chlorophyll=, _n._ From two Greek words meaning “light green” and “leaf,” leaf-green; the green coloring matter of vegetation. =Columbine=, _n._ L. _columba_, a dove; a flowering plant which gets its name from the fancied resemblance of its petals and sepals to the heads of doves round a dish. =Complexity=, _n._ L. _com_, together, _plectere_, to weave; formed by a combination of simple things. =Convolvulaceæ=, _n._ The name of a family of plants to which belong the morning-glory and bindweed. =Cornucopia=, _n._ L. _cornu_, horn, _copia_, plenty; horn of plenty. =Corolla=, _n._ L. _corolla_, a little crown; a garland; the floral envelope within the calyx, very often bright colored. =Cotton-seed oil=, _n._ An oil expressed from the seeds of the cotton plant and, when purified, used instead of olive oil. =Crete=, _n._ An island to the south of Greece. =Crocus=, _n._ An early spring flower. =Cross-fertilization=, _n._ The fertilization of the ovules of one flower by the pollen of another. =Cross-fertilized=, _a._ Fertilized by the pollen from another plant. D. =Dew=, _n._ The moisture of the air when condensed on any cold surface. Dew does not _fall_; it is formed wherever moisture in the air comes in contact with a substance colder than the air. Hence there may be dew on the under as well as the upper side of a leaf. =Dissolve=, _v._ L. _dis_, apart, _solvere_, loose; to separate the solid particles of a body in a liquid; to melt. Sugar dissolves in water. =Double flowers=, _n._ All those whose petals are numerous. Sometimes the stamens are changed into petals, as in double roses, and sometimes even the pistils have become petals. E. =Evaporation=, _n._ The conversion of a solid or liquid by heat into vapor. Most often used in reference to the conversion of water into vapor. The warm air of summer causes a rapid evaporation of water from the leaves of plants. F. =Fayal=, _n._ One of the Azores Islands, west of Portugal.