xviti VEGETABLE PHYSIOLOGY 
PAGR 
propagation—Formation of asexual reproductive cells, spores or 
gonidia ; zooccenocytes—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 420-447 
CHAPTER XXVI 
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 
—Hy bridisation—Results of fertilisation ; formation and ripening 
of fruits and seeds—Germination of the seed—Apospory ; apogamy ; 
parthenogenesis . : 7 : . ° 7 . 448-460 
INDEX E 2 . $ : : ‘ . 461-470 
