98 EXPLANATORY TABLE ON 



CUTIS, OR INNER BARK Consists of a particular modification of 



tubes and cellular tissue, by which the sap returns from the 

 leaves through the stem to the roots : nourishing in its progress 

 , the several parts, 



CORTICAL VESSELS. The vessels of the inner bark. 



ALBURNUM. The live or sap wood, consisting of cells and tubes, through 

 which the sap ascends from the root, through the stem and branches 

 to the farthest extremity of the leaves, there to receive the 

 the requisite changes. 



THE HEART, OR DEAD WOOD. The part of the wood in which the 



vessels have been obliterated by pressure in advanced agt, and 

 is only to be seen in old trees. 



THE PITH. - -A soft spongy substance, composed of a tissue of cells, 

 filled with a watery fluid, situated in the centre of the root, stem, 

 and branches, intended to promote the growth of young shoots. 



PEDUNCLE. The uniting stalk of the leaf, or flower, to the parent 



source. 



CALYX, The cup that supports the flower. 



COROLLA. -The blossom, consisting of the whole of the leaves of the 



flower. 



PETALS.- The leaves of the flower separately. 



RECEPTACLE. The base of the flower, upon which the other parts rest. 



NECTARIUM, OR NECTARY. A small sac. or bag, containing honey, 



generally situated in the petals of flowers. 



STAMENS. -Small thread-like substances within the corolla, divided 



into anther and filament. 



ANTHER. Small prominent bags at the top of the stamen, containing 



the dust which forms the great fertilizing principle. 



FILAMENT. A fine line or thread passing from the anther into the 



receptacle. 



PISTIL. A column-shaped substance, in the centre of the flower, consisting 



of the stigma, style, and ovary. 



STIGMA. -A small glandular-looking substance, of a triangular form, at 



the top of the pistil. 



STYLE. The middle portion of the pistil. 



OVARY. The base of the pistil, which fertilized, produces a new plant. 



POLLEN. The farina or dust, contained in the anther of the stamen, 



which, dropped on the stigma of the pistil, fertilizes the ovary. 

 THE SEED -Consists of the cotyledon and the embryo plant. 



THE COTYLEDON. That portion of the seed which by a chemical 



process is converted into nutriment to supply the embryo plant. 



