INDEX. 



483 



large conspicuous flowers more 

 frequently visited by insects than 

 email inconspicuous ones, 384; 

 SoJanum generally unattractive 

 to insects, 389 ; Lamium album, 

 390,391 ; on aneinophilous plants, 

 401 ; fertil'sation of Plant<i<i<>. 

 403 ; si cretion of nectar, 407 : 

 instinct of bees sucking nectar, 

 418; bees frequenting flowers of 

 the sime species, 4l!; cause of 

 it, -J21 ; powers of vision and 

 discrimination of bees, 425 



Miiller, Dr. H., hive-beea occa- 

 sionally perforate the flower of ; 

 Erica tetralix, 430; calyx and , 

 corolla of Rliinanthus alectero- 

 lophus bored by Bombus mastru- ; 

 cfituK, 435 



Munro, Mr., some species of Onci- j 

 dium and Maxillaria sterile 

 with own pollen, 334 



Myrtace<e,4l4: 



Nageli on odours attracting insects, 

 374 ; si-xual relations, 411 



Natural selection, effect upon self- 

 .-tei ility and self- fertilisation, 345, 

 lilt; 



Xaudin on number of pollen-grains 

 necessary for fertilisation, 24 ; 

 Petunia'violacea, 188 



NVrtar regarded as an excretion, 403 



Nemophila insignia, 182; measure- 

 ments, 183-185; early flowering 

 of crossed plant, 293 ; effects of 

 cross and self-fertilisation. 303; 

 seeds, 316, 323 



Xepeta glechoma, 419 



\rcotiana glutinosa, 210 



tabacum, 203 ; measurements, 



205-208 ; cross with fresh stock, 

 210; measuremtnts, 212-215; 

 summary of experiments, 266, 

 2'JT, '-79; superioiity of crossed 

 plants, '288-290; early flowering, 

 2H3-295; seeds. 323, 325; ex- 

 periments on, 349; self-fertile, 

 3;8 



Nolana prostrata, 186; measure- 

 ments, 187; crossed and self- 

 fertilised p'ants, 277; number of 

 capsules and seeds, 321, 323; 

 self-fertile, 368 



Nolanacex, 186 



Nymphxa, 358, 3t5 



0. 



Odours emitted by flowers attractive 

 to insects, 374 



Ojje, Dr., on Digitalis purpurea, 

 82 ; Gesneria, 92 ; Phaseolus mul- 

 tiftorus, 151, 360, 434; perfora- 

 tion of corolla, 429 ; case of the 

 Monkshood, 431 



Onagracex, 169 



Onion, prepotency of other polk-n, 

 395 



Ononis minutissima, i67 ; meaaure- 

 ments, 168; seeds, 323; self- 

 fertile, 367 



Ophrys apifera, 350, 369, 408, 442 



musct/era, 385, 408 



Oranges, spontaneous crossing, 395 



Orchidex, 364, 369; excretion of 

 saccharine matter, 404 



Orchis, fly, 408 



Origanum vulgare, 94; measure- 

 mentx. 95; early flowering of 

 crossed plant, 292; effects of 

 intercrossing, 301 



P. 



Pseony, number of pollen-grains, 



377 



Papaveracex, 107 

 Papaver alpinum, 331, 358 



argemonoides, 366 



bracteatum, 108 



dubium, 107 



orientate, 108 



rhaas, Iu7 



somniferum, 108, 331, 365 



vagum, 107; measurementa, 



