INDEX. 



483 



MT7LLER. 



large conspicuous flowers more 

 frequently visited by insects than 

 email inconspicuous ones, 384; 

 Solarium generally unattractive 

 to insects, 389 ; Lamium album, 

 390,391 ; on anemophilous plants, 

 401 ; fertilisation of Plantago, 

 403 ; secretion of nectar, 407 ; 

 instinct of bees sucking nectar, 

 418 ; bees frequenting flowers of 

 the same species, 419; cause of 

 it, 421 ; powers of vision and 

 discrimination of bees, 425 



Midler, Dr. H., hive-bees occa- 

 sionally perforate the flower of 

 Erica tetralix, 430 ; calyx and 

 corolla of Bhinanthus alectero- 

 lophus bored by Bombus mastru- 

 catw, 435 



Munro, Mr., some species of Onci- 

 dium and Mazillaria sterile 

 with own pollen, 334 



Myrtacex, 414 



N. 



Nageli on odours attracting insects, 

 374 ; sexual relations, 411 



Natural selection, effect upon self- 

 sterility and self-fertilisation, 345, 

 346 



Naudin on number of pollen-grains 

 necessary for fertilisation, 24 ; 

 Petunia violacea, 188 



Nectar regarded as an excretion, 403 



Nemophila insignis, 182; measure- 

 ments, 183-185; early flowering 

 of crossed plant, 293 ; effects of 

 cross and self-fertilisation, 303; 

 seeds, 316, 323 



Nepeta glechoma, 419 



Nicotiana glutinosa, 210 



tabacum, 203 ; measurements, 



205-208 ; cross with fresh stock, 

 210 ; measurements, 212-215 ; 

 summary of experiments, 266, 

 267, 279 ; superiority of crossed 

 plants, 288-290 ; early flowering, 

 293-295; seeds, 323, 325; ex- 

 periments on, 349 ; self-fertile, 

 368 



PAFAVEK. 



Nolana prostrata, 186; measure- 

 ments, 187; crossed and self- 

 fertilised plants, 277; number of 

 capsules and seeds, 321, 323 ; 

 self-fertile, 368 



Nolanacex, 186 



Nymphxa, 358, 365 



Odours emitted by flowers attractive 

 to insects, 374 



Ogle, Dr., on Digitalis purpurea, 

 82 ; Gesneria, 92 ; Phaseolus mul- 

 tiflorus, 151, 360, 434; perfora- 

 tion of corolla, 429 ; case of the 

 Monkshood, 431 



Onagracex, 169 



Onion, prepotency of other pollen, 

 395 



Ononis minutissima, i67 ; measure- 

 ments, 168 ; seeds, 323 ; self- 

 fertile, 367 



Ophrys apifera, 350, 369, 408, 442 



rnusci/era, 385, 408 



Oranges, spontaneous crossing. 395 



Orchidex, 364, 369 ; excretion of 

 saccharine matter, 404 



Orchis, fly, 408 



Origanum vulgare, 94; measure- 

 ments, 95; early flowering of 

 crossed plant, 292 ; effects of 

 intercrossing, 301 



Pseony, number of pollen-graiaa, 



377 

 Papaveracex, 107 

 Papaver alpinum, 331, 358 



argemonoidee, 366 



bracteatum, 108 



dubium, 107 



orientale, 108 



rh&as, 107 



somniferum, 108, 331, 365 



ragum, 107 ; measurements 



