xvi VEGETABLE PHYSIOLOGY 



CHAPTEK XXV 



THE NERVOUS MECHANISM OF PLANTS 



PAGE 



The purposeful responses of plants to stimulation ; relation of stimulus 

 to effect Nature of nervous mechanisms Sense organs and their 

 differentiation Motor mechanisms of plants Contraction 

 Eegulation of supply of water to the cell Glandular organs Con- 

 duction of impulses ; continuity of protoplasm Co-ordination of 

 impulses Latent period of stimulation After-effects Fatigue 

 Anaesthetics Comparison of nervous mechanisms of plants and 

 animals 397-410 



CHAPTEE XXVI 



REPRODUCTION 



Distinction between the individual protoplast and the colony or plant 

 Process of multiplication of protoplasts ; gemmation, karyo- 

 kinesis, formation of cell- walls ; free-cell formation Vegetative 

 propagation Formation of asexual reproductive cells, spores or 

 gonidia ; zoocoenocytes Development of sexual cells or gametes : 

 planogametes and conjugation ; male and female cells ; anthero- 

 zoids and oospheres Gametangia and their varieties Fertilisation 

 Alternation of generations Gametophytes and sporophytes 

 Heterospory and its consequences The seed and its formation 411-436 



CHAPTEE XXVII 

 REPRODUCTION (continued) 



Pollination and its mechanisms Advantages of cross-pollination 

 Dichogamy, protandry, protogyny Diclinism Heterostylism or 

 dimorphism Prepotency Self-sterility Self-pollination ; cleisto- 

 gamy Mechanism of fertilisation ; the growth of the pollen-tube 

 Hybridisation Eesults of fertilisation ; formation and ripening 

 of fruits and seeds Germination of the seed Apospory ; apogamy ; 

 parthenogenesis . . . -. -" ; ' ; . -.- --., : - - . . 437-449 



INDEX ..^".. . '. .;;.:.'.:-- ' :; . - . 451 



