xvi List of Illustrations 



FIGURE PAGE 



22. Cupid sweet pea (photo by Beal) . . . . . .78 



23. Linaria vulgaris peloric flowers * . . . . .81 



24. Linaria vulgaris peloria ....... 82 



25. Antirrhinum majus ' -. .83 



26. Chrysanthemum segetum plenum . . . . . . 86 



27. Chrysanthemum inodorum plenissimum .... 87 



28. Ancestral generations of Chrysanthemum segetum plenum . 88 



29. A, Chrysanthemum segetum; B, Chrysanthemum segetum 



grandiflorium (after purification) . . . . .89 



30. Extreme variability in the shape of the leaves of hybrid pop- 



pies. Second generation from a cross between the Bride 

 variety of the Opium poppy and the Oriental poppy . 96 



31. Inbred corn plants, showing lessened vigor of growth 



(adapted from Yearbook) .113 



32 Hybrid walnut and parents . . . * . . 117 



33. A hybrid walnut (Juglans calif ornica nigra), reaching 



double the height of ordinary trees . . . . 119 



34. Variation in hybrid pineapples . . . v . . 123 



35. Variation in hybrid squashes . . . ... .129 



36. Hybrid citrange and its parents, Poncirus (citrus) trifoliata 



and common sweet orange . . . . . .132 



37 . Hybrid tangelo and its parents, pomelo and tangerine . . 133 



38. Samson tangelo (adapted from Yearbook) . . . . 134 



39. Citranges (hybrid of orange and Poncirus (citrus} trifoliata) 135 



40. Teosinte and its hybrids with Indian corn . .... 137 



41. Cytisus Adami '. . 143 



42. Cytisus Adami . 144 



43. Mendelism in maize . . . . . . . . 162 



44. Diagrammatic representation of Mendel's law . . . 170 



45. Hybrid carnation between a single and a burster, showing 



intermediacy . . 180 



46. Fowls' combs 184 



47. Three generations of hybrid wheat 195 



48. Mendelism in tomatoes 203 



49. Pride of Georgia, a good short-staple cotton .... 213 



50. Select Jones improved cotton with uniform long staple . 214 

 61. Improving the tomato 215 



