INDEX AND GLOSSARY 



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Cyanophyceac, 376. 



Cyathium, a condensed spicate in- 

 florescence contained in a cup-like 

 involucre : of spurge, 629 (Fig. 



479). 

 Cycadales, 526. 

 Cycas, motile male gametes of, 527 



(Fig. 415). 

 Cycle of Life, in seed-plants, 335 



(Fig. 257). 

 Cyclic arrangement of leaves where 



two or more are seated at the same 



level, 201 ; of parts of flower, 263 



(Fig. 187). 

 Cydonia (Quince), flower of, 255 



(Fig. 177). 

 Cynara, spread of, in La Plata, 



33i- 



Cynoglossum, hooked-fruits of, 328 



(Fig. 251, C). 

 Cyperaceae, 615. 

 Cyperus, girder construction in, 181 



(Fig. 113). 

 Cystopus, fertilisation in, 410 (Fig. 



3io) ; 447- 

 Cytase, the digestive ferment for 



cellulose, 125. 

 Cytisus adami, reputed graft-hybrid, 



251- 



Cytoplasm, the protoplasmic body of 

 the cell exclusive of the nucleus, 

 17, 29 ; movements of, 30 ; per- 

 meability of lining, 36, 38, 39. 



Daffodil, 609. 



Dahlia, 197 ; storage roots of (Fig. 



130) ; storage in, 124. 

 Daisy, capitulum of, 262 (Fig. 186). 

 Damping-off disease, 396, 397, 399 ; 



general account of, 402. 

 Dandelion, capitulum of, 651 (Fig. 



502) ; clock, 326 (Fig. 247). 

 Dasylirion, qualities of fibres of, 178. 

 Date, storage in, 125. 

 Datura, stigma of, 292 (Fig. 214.) 

 Daucus Carota (Carrot), 654, 655. 

 Dead-nettle (Lamium), 645 (Fig. 



496). 

 Dead-weight, mechanical support of, 



181. 

 Deciduous, applied to plants which 



drop their leaves at certain seasons, 



194. 

 Decussate arrangement, of leaves in 



successive alternating pairs, 201 ; 



of Sycamore (Fig. 134) , of Epilo- 



bium (Fig. 133). 

 Deficiency disease, due to want of 



necessary vitamin, 662. 



Dehiscence, splitting, especially of 

 sporangial or carpellary walls : in 

 anthers, 282 ; in fruits, 323. 



Dehydrases, 137. 



De-plasmolysis, 37. 



Dermatogen, a layer of cells, usually 

 superficial, giving rise to the epi- 

 dermis, 312 (Fig. 230, v.-viii.). 



Descent, lines of, 355. 



Deschampsia caespitosa, viviparous 

 habit, 248. 



Desmidiaceae, 374 (Fig. 278). 



Desmoncus, straggling by reflexed 

 pinnae, 215 (Fig. 143, vii.), 345. 



Destructive metabolism, 134. 



Dextrorse twining, following hands 

 of watch, 2 1 6. 



Dialysis, 32. 



Diaphototropism, 159. 



Diastase, ferment converting starch 

 to sugar, 123 ; action of, 129, 130. 



Diatoms, 374, 375 ; life-cycle of, 390. 



Dichasium, a definite or cymose 

 inflorescence, where two lateral 

 branches arise at about the same 

 level, 250 (Fig. 180). 



Dichotomy, a forking into two equal 

 branches, 348. 



Dicksonia, pith of, 598. 



Diclinous, where staminate or pistil- 

 late flowers are borne on the same 

 plant, 301. 



Dicotyledoneae, 605, 619. 



Dicotyledons, seed-plants (Angio- 

 sperms), having an embryo with 

 two seed-leaves, 3, 7 ; herbaceous 

 stems of, 42 ; woody, 55 ; root of, 

 85 (Fig. 59) ; old root, 92 (Figs. 

 66, 67) ; mechanical construction 

 of stem, 1 81 ; embryology of, 311 

 (Fig. 230). 



Dictyota, 378, 384 ; apex of, 379 ; 

 tetraspores of, 383, 390 ; alterna- 

 tion in, 383, 390, 545. 



Differentiation : of tissues, the gradu- 

 ally acquired distinction of charac- 

 ter as the cells mature from an un- 

 differentiated embryonic tissue, 

 21 ; of sex, 557 ; of gametes, 558 ; 

 in Brown Algae, 382 ; in Green 

 Algae, 370 ; under enzymes in 

 Heather, 230. 



Digestion, intra-cellular, 232 ; by 

 Carnivorous Plants, 240. 



Digestive ferment, of Fungi, 394 

 (Fig. 294). 



Digestive sac, the layer of cells which 

 softens the outer-lying tissues for 

 the passage outwards of the lateral 

 root, 90 (Fig. 65). 



