INDEX AND GLOSSARY 



691 



Radial symmetry, where an organ or 

 shoot develops equally all round, 

 200. 



Radicle, first shoot of the embryo, 7. 



Raffiesia, parasitism of, 226 (Figs. 

 154, 155) ; flower of, 227 ; numer- 

 ous seeds of, 242. 



Ragged Robin, 620 (Fig. 470). 



Raisin, analysis of, 657. 



Ranunculaceae, 622 (Figs. 472-475). 



Ranunculus, 623 (Fig. 474). 



Raphides, 54 (Fig. 33). 



Raspberry, 635 (Fig. 488) ; analysis 

 of, 657. 



Ray-florets, of Compositae, 648 (Fig. 

 500). 



Receptacle, the dilated floral axis on 

 which the parts of the flower are 

 inserted, 254 ; various develop- 

 ment of, 271 (Figs. I95- IQ 7) I 

 general receptacle of capitulum, 

 262 (Fig. 186) ; arrangement of 

 parts upon, 264 ; succulent, of 

 strawberry, 329 (Fig. 254) ; of 

 sorus in Ferns, 495 (Fig. 387). 



Recessive, as in dwarf-habit of Peas, 

 570 (Fig. 435). 



Re combinations, Mendelian, geno- 

 types appearing in the second 

 generation of hybrids, in which 

 some of the characters of the two 

 original parents have been inter- 

 changed, 578, 585. 



Red Algae, 387. 



" Red-Sea," algal origin of name, 



377- 



Red Snow, 362. 



Reduction, a nuclear change by which 

 the number of chromosomes is 

 halved, 267, 533 (Fig. 429). 



Reduction division, the first division 

 in the spore-mother-cell by which 

 the number of chromosomes is 

 reduced to one half, 533, 536 ; its 

 relation to Mendelian segregation, 



572. 

 Reproductive organs, production of, 



151- 



Reseda, lateral roots of, 88 (Fig. 



63)- 

 Reserve cellulose, 125 (Fig. 83) ; 



proteins, 126 (Fig. 84). 



Reserve materials, storage of, 131 ; 

 mobilisation of, 130. 



Resin passages, of Coniferae, 502. 



Respiration, 133 ; demonstration of, 

 135 (Fig. 87) ; rise of temperature 

 in, 137 ; aerobic and anaerobic, 

 136; a means of liberating energy, 



i~37. 



Respiration and growth, 135. 



Respiratory quotient, 136. 



Response to stimulus, 8. 



Rest, period of, 334. 



Resupinate, of flower, rotation 

 through half a circle so that pos- 

 terior side appears anterior ; in 

 Orchis, 612. 



Reticulate venation, of leaf of Dicoty- 

 ledon, 71 (Fig. 46). 



Retting of Flax, 452. 



Rhea, fibres of, 177. 



Rhinanthus, haustoria in ovule, 316 

 (Fig. 235). 



Rhizoctonia, a mycorrhizic Fungus, 

 231 (Figs. 158, 159). 



Rhizoids, of Mosses, 462 (Fig. 356). 



Rhizomorphs, root-like strands of 

 Armillaria, parasitic, 394. 



Rhizophores, root-bearing organs of 

 Selaginella, 514 (Fig. 405). 



Rhizopus, 416. 



Rhododendron, evergreen, 194 ; leaf 

 arrangement, 204 (Fig. 137) ; 

 pollen-tubes in style of, 305 (Fig. 



225). 

 Rhodomela, 393 (Fig. 291). 

 Rhodophyceae, 355, 387 ; alternation 



in, Chap, xxxiv. 

 Rhoeadales, 625. 

 Rhopalodia, 375. 

 Rhynie fossils, 479 (Fig. 372 a). 

 Ribes, leaf of, 350 (Fig. 263), 631 



(Figs. 459, 4 6 °)- 



Riccia, archegonia of, 474 (Fig. 

 370) ; sporogonium of, 548 ; ob- 

 conical sporeling of, 592 (Fig. 

 448). 



Ricciocarpus, sporogonium of, 476 

 (Fig. 372). 



Rice, analysis of, 660 ; origin of, 

 661. 



Ricinus, (Castor Oil), 10 (Fig. 4) ; 

 hvpocotyl after thickening, 58 

 (Fig. 37) ; oil, 125 (Fig. 84). 



Rickets, a deficiency disease, 662. 



Ringing experiments, 132 (Fig. 86). 



Rivularia, 376. 



Robinia, leaf of, 349 (Fig. 260). 



Roller-milling, 600. 



Root, 7 ; structure of, Chap. vi. ; 

 activity of, q6 ; secondary thicken- 

 ing of, 92 (Fig. 66) ; construction 

 of, 82 (Fig. 56) ; lateral movement 

 of water, 99 (Fig. 68) ; zones of 

 growth in, 143 (Fig. 89) ; negative 

 phototropism, 159, 170 (Fig. 126) ; 

 storage in, 190 (Fig. 130) ; sym- 

 metry of, 199 ; modified as suckers 

 in Dodder, 225 (Fig. 152) ; cate- 



