LIST OF ILLUSTRATIONS XIX 



flG. PAGB 



220 Formation of zygospores of the Black Mould of bread 396 



221 Green Mould' of cheese 397 



222 Spore of Corn-Smut germinating 398 



223 Spore of Corn-Smut producing conidia 399 



221 Summer Spores, or uredospores of the Black Stem Rust of Wheat 402 



225 Autumn spores, or teleutospores of the Black Stem Kust of Wheat 402 



226 Summer spores of the Black Stem Rust of Wheat, germinating on a 



Wheat leaf and sending the germ tubes through the stomata 402 



227 Autumn spores of the Black Stem Rust of Wheat producing conidia . . +03 



228 Section of Barberry leaf showing Rust 403 



229 Cluster-cup of Black Stem Rust of Wheat 404 



230 Perithecium of the common Mildew of the Lilac 407 



231 Increased size due to hybridization (without selection) 411 



232 Increased size due to selection (without crossing) 411 



233 Improved Beach Plum 413 



234 Branch of Improved Beach Plum 414 



235 The Plumcot, a cross between the Plum and the Apricot 415 



236 The Stoneless Plum and its parents 410 



237 Curve of variation 418 



238 Assymmetrical curve of variation 419 



239 Double curve of variation 419 



240 Shasta Daisy and its American parent 423 



241 Shasta Daisy, variations 424 



242 Shasta Daisy, double 425 



243 Variation in leaves of hybrid Blackberries 426 



244 Variation in stems of hybrid Blackberries 427 



245 Variation in leaves of hybrid Poppies 429 



246 Plum blossom, with anthers and petals removed 431 



247 Flowers of Lamarck's Evening Primrose 444 



248 Lamarck's and Dwarf Evening Primrose 4+5 



249 Leaves of Lamarck's and Broad Evening Primrose 446 



250 Seedlings of Lamarck's, Pale and Broad Evening Primrose 447 



251 Pour-, five- and seven-leaved Clover 448 



252 Ten-leaved Clover 449 



253 Atavistic Clover 449 



