Contents 
CHAPTER XXVI 
THEORY OF PLANT-BREEDING 
Acquired characters—Desert plants—Little species of Lamarck—Supply 
and demand in the plant—American trotting-horse—Germ plasmas 
and Begonia—Mutation—CEnothera Lamarckiana—Double flowers 
—Fasciation—Physiological state—Mendel and his experiments 
—Presence and absence of colour—Miss Saunders’ stocks—Hurst’s 
tomatoes—Dominance—Pollen parent affecting colour—Iris with 
six stamens—Grafting and its effects . . . . ’ . 
CHAPTER XXVII 
SCRUB 
Thorny acacias—Maqui—Gum-cistus—Scented labiates—Garigue— 
Wild-olive woods of Spain—Sheep in Spain—Moors and slave- 
labour—Mediterranean cultivation—Goats and other animals— 
Balearic islands—Gums and perfumes—Flower industry—Mos- 
quitoes and basil—Ethereal oils and their importance—Cape 
Colony, Australian, Californian and Chilean scrub 6 . : 
CHAPTER XXVIII 
TROPICAL FORESTS 
Wet jungle of West Africa—Elephant grass—Leaf-stories in the jungle 
—Animal life—Insects—South Mexican forest—Rubber and its 
collection—Rubber plantations—Oil palms—Mosquito and malaria 
—Extending cultivation—Fires in Nigeria—Mangrove forest— 
Seedlings of Rhizophora—Colonisation of mud. ° . A 
CHAPTER XXIX 
ON EVIL IN SMALL DOSES 
Origin of variations—Biometrical researches—Pure lines—Sugarbeet— 
Roots and carbonic acid—Salt on plants—Mineral poisons—Alcohol 
and ether—Electricity—Heat and cold—Gladiolus bulbs and 
wounds—Fungus and insect attacks—Palm leaves falling—Enzymes 
—AMiss Gibson and chrysanthemum fungus—Mr. Salmon’s mildews 
and bromes—Rusts and mildews—Infection of sickly plants— 
Begonia and a cucumber fungus—Mycorhiza—Lichens—Insect 
visits—Animal injuries—Effect of man—Students of Nature . 
BIBLIOGRAPHY . oe . . ery , ‘ p 
INGER: %. GR eS OR oe OS Se SO 
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