iv Contents, 
PAGE 
15. Hesperis Matronalis 136 
16. Clarkia Pulchella ; . . . 144 
17. Plantago Lanceolata Ramosa 148 
VI. EXPERIMENTAL OBSERVATION OF THE ORIGIN OF VARIETIES. . 161 
18. The Origin of Chrysanthemum Segetum Plenum .... 161 
19. Double Flowers and Flowerheads 194 
20. The Origin of Linaria Vulgaris Peloria 201 
21. Heritable Pelorias 220 
VII. NON-ISOLABLE RACES 227 
22. Trifolitim Incarnatum Quadrifolium 227 
23. Ranunculus Bulbosus Semi-Plenus 243 
24. Variegated Leaves 265 
25. Alternating Annual and Biennial Habit 291 
VIII. NUTRITION AND SELECTION OF SEMI-LATENT CHARACTERS. 307 
26. Increased Nutrition Favors the Development of the 
Anomaly 307 
27. The Influence of External Conditions and of Manur- 
ing 315 
28. The Periodicity of Semi-Latent Characters 323 
29. The Choice of Seeds in Selection 332 
PART II. 
THE ORIGIN OF EVERSPORTING VARIETIES. 
I. TRICOTYLOUS RACES 343 
1. The Occurrence of Tricotyls as Half Races and Inter- 
mediate Races 343 
2. Tricotyls, Hemi-Tricotyls and Tetracotyls 356 
3. The Influence of Tricotyly on the Arrangement of 
Leaves 365 
4. Tricotylous Half Races 3/9 
5. Tricotylous Intermediate Races Do Not Arise by Se- 
lection 393 
6. The Isolation of Tricotylous Intermediate Races .... 417 
7. Partial Variability of Tricotyly 444 
8. The Influence of External Conditions on Tricotyly . . 450 
II. SYNCOTYLOUS RACES 457 
9. Hemi-Syncotyly, Syncotyly, Amphi-Syncotyly 457 
10. Helianthus Annuus Syncotyleus 466 
11. Improvement of a Hemi-Syncotylous Race 476 
12. Atavistic Races 481 
