CONTENTS OF HALF-VOLUME IV, 



LIST OF ILLUSTEATIONS. 



FAGB 



Plate XV. Frondose and Fruticose Lichens, - - - to face 694 



„ XVI. Eucalyptus Grove and Grass-trees in Australia, - - 730 

 Illustrations in the Text — Fig. S57 to Fig. 482. 



The History of Species {Continued). 



2. Alteration in the Form of Species (Continued)— 



The Influence of Mutilation on the Form of Plants, - - - - - 514 



Alteration of Form by Parasitic Fungi, - - - 518 



Alteration of Form by Gall-producing Insects, 527 



The Genesis of New Forms as a result of Grossing, ----- 554 



3. The Origin of Species — 



The Genesis of New Species, - ..... 576 



Derivation of Existing Species, - ..... 595 



The Subdivisions of the Vegetable Kingdom, ... . 600 



4. The Distribution of Species — 



The Distribution of Species by Oifshoots, ... 790 



The Dispersion of Species by Means of Fruits and Seeds, ... - 833 



Limits of Distribution, ..... 878 



Plant Communities and Floras, - ... 885 



5. The Extinction of Species, - - 899 



