Contents 



CHAPTER XXVI 



THEORY OF PLANT-BREEDING 



PAGE 



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 295 



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 . . . 307 



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 .... 316 



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 

 Miss 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 . . 327 



BIBLIOGRAPHY 338 



INDEX 348 



xiv 



