588 



INDEX. 



Quercus rirem, manner of germina- 

 tion, 85, 557 



Radiation at night, effect of, 0:1 

 b aves, 284-286 



Radicles, manner in which they 

 penetrate the ground, 69-77 ; cir- 

 cumnutation of, 69 ; experimenfs 

 with split sticks, 74 ; with 

 wooden pincers, 75; sensitiveness 

 of apex to contact and other irri- 

 tants, 129 ; of Vicia fdba, 132- 

 15S; various experiments, 135- 

 140; summary of results. 143-151; 

 power of an irritant on, com- 

 pared with geotropism, 151-154; 

 sensitiveness of tip to moist 

 air, 180 ; with greased tips, 

 185 ; effect of killing or injuring 

 the primary radicle, 187-191 ; 

 curvature of, 193; affected by 

 moisture, 198; tip alone sensitive 

 to geotropism, 540; protrusion 

 and circumnutation in a germina- 

 ting seed, 548; tip highly sen- 

 sitive, 550; the tip acts like the 

 brain of one of the lower animals, 

 573 



, secondary, sensitiveness of 



the tips in the bean, lot ; become 

 vertically geotiopic, 186-191 



Barney on the movements of the 

 cotyledons of Mimosa pudica, 

 &m\ Clianthus Dampieri at night, 

 297 



Ranunculus Ficaria, mode of 

 breaking through the gr.und, 

 86, 90 



, * ingle cotyledon, 96 



, effi ct of lateral light, 484 



Raplianus Kativa, s nsitiveucss of 

 apex of radicle, 171 



, sleep of cotyledons, 301 



Rattan, Mr., on the germination of 

 the seeds of Megarrhi.a Califor- 

 nia, 82 



Relation between circumnutation 

 and heliotropism, 435 



SACHS. 



Reseda odorata, hypocotyl of seed- 

 ling slightly heliotrnpic, 454 



Reversion, due to mutilation, 190 



Rhipsdlis cassytha, rudimentary co- 

 tyledons, 97 



Ricinns Borboniens/s, circumnuta- 

 i tion of arched hypocotyl, 53 



Robinia, effect of bright sunshine 

 on its leaves, 445 



pseudo-ctcacia, leaflets vertical 



at night, 355 



Rodier, M., on the movements of 

 Ceratnphyllum dem^rsum, 211 



Royer, Cn.,on the sleep-movements 

 of plants. 281, n. ; on the sle p of 

 leaves, 318 : the leaves of Mnli- 

 cago maculatd, 345 ; on Wistaria 

 Sinensis, 354 



Rubus id&us (hybrid) circumnuta- 

 tion of stem, 205 



, apogeotropic movement of 



stem, 498 



Ruiz and Pavon, on Porlier.'a hy- 

 (jrometrii-a, 336 



SACHS on " revolving nutation," 1 ; 

 intimate connection between tur- 

 gescence and growth, 2, n. ; coty- 

 ledon of the onion, 59 ; adapta- 

 tion of root-hairs, 69 ; the move- 

 ment of the rad.cle, 70, 72, 73; 

 movement in the hypocotyls of 

 the bean, &c, 91 ; sensitiveness 

 of radicles. 131, 145, 198; sensi- 

 tiveness of the primary radicle 

 in the bean, 155.; in the com- 

 mon pea, 156 ; effect of moist 

 air, 180; of killing or injuring 

 the primary radicle, 186, 187 ; 

 circumnutation of flower-stems, 

 225; epinasty, 2G8 ; movements 

 of leaflets of Trifolium incar- 

 natum, 350; action of li^ht in 

 modifying the periodic move- 

 ments of leaves, 418 ; on geotro- 

 pism and heliotropism, 436, . ; 

 on Tropceolum majut, 453 ; 



