GLOSSARY AND INDEX. 91 



O'ospore, 52: the embryo of Acrogens, etc. 



Or'chids, 71: a group of plants with very peculiar flowers. 



Or'ders, 25 : subdivisions of classes. 



Organic forms, 45 : forms of animals or vegetables. 



Organization, 9, 27 : the arrangement of organs or parts. 



Or'gans of nutrition, 66. 



Oil-pas'sages, 36 : cavities conveying oil. 



O'vary, 68 : the lower part of the pistil. 



O'vate, 65 : egg-shaped. 



(/vide, 68 : a young seed. 



Pab'ulum, 15 : food. 



Palms, 71 : a group of conspicuous tropical plants. 



Pedun'cle, 77 : the stalk of the flower or fruit. 



Perianth, 68 : the envelope of the flower when caylx and corolla are 

 indistinguishable. 



Perig'ynous, 69 : around the ovary. 



Permanent tis'sue, 34 : bells in a plant incapable of f urther growth. 



Peren'nial, 61: plants which live more than two years. 



Petiole, 64 : the foot-stalk of a leaf. 



Pet'al, 68 : the leaf of the corolla. 



Pin'riate, 65 : a compound leaf, with leaflets along a common pe- 

 tiole. 



Pis'til, 67 : the central organ of a flower. 



Papilionaceous, 78: butterfly-like. 



Pin'nule, 54 : a branchlet of a pinnate frond or leaf. 



Pollen, 69 : the fecundating dust in the anther of a flower. 



Pop'pies, 79 : a genus of flowering plants. 



Physical forces in bioplasm, 15. 



Pith, 39: the central cells in the stem of plants. 



Primordial u'tricle, 28 : the mucilaginous layer within the cell-wall 

 of a cell. 



Pro'tococcus, 40 : a genus of primitive plants. 



Pro'tophytes, 26 : the simplest type of plants. 



Plant migration, 81. 



Pro-em'bryo, 52 : a temporary structure in the early life-history of 

 Acrogens. etc. 



Pro'toplasm, 13: the physical basis of life, or rather, of living 

 matter. 



