ILLUSTRATIONS. 



PLATES. 



Patre. 



Pr.ATE I. Fig. 1. — TeshnLT the g.ntcii of new wheats as to its amount and 

 savngth: Fig. 2. — Making the bakers" .sponge test of 



new varieties of wheat ... _ 28 



IT. Fig. 1. — Improvement of flax by selection; Fig. 2. — Planting 



seeds in the crop nursery . , . . . __.... 34 



III. Fig. 1. — Two centgener plats of wheat; Fig. 2. — Men emasculating 



and cross-pollinating wheat ......... 46 



lY. Fig. 1. — Harvesting twentieth-acre plats of wheat: Fig. 2. — 



Thrashing and cleaning wheat from centgener plats . 48 



V. Mi ling samples of wheat . .... .. ..._ ... 50 



VI. Fig. 1. — Si)ikes of parent and hybrid wheats: Fig. 2. — Spikes of 



timothy, showing improvements by selection . 56 



TEXT FIGURES. 



Fig. 1 . Graphic e.xpression of Quetelet's law 1 . 18 



2. Yields in grams of 80 Powers Fife wheat plants, arranged in order 



as numbered . . ...... . . . . . . 18 



3. Y'ields in grams of 80 Powers Fife wheat plants, arranged in order 



of yield . .. 18 



4. Yields in gi-ams of 80 plants of Blue Stem wheat, arranged in order 



as numbered . ...... 19 



5. Y'ields in grams of 80 plants of Blue Stem wheat, arranged in order 



of yield. .. .. .. 19 



6. Yields in grams of 86 Fife-Blue Stem hybrid wheat plants, arranged 



in order as unmV)ered . . ... ..... . .. .. 19 



7. Yields m grams of 86 hybrid wheat plants, arranged in order of 



yield ... - . . .... . . 20 



8. Y'ields in grams of 100 Blue Stem and 100 Fife wheat plants com- 



pare i - - .- - - . 



9. Yields in grams of 100 plants each of Fife, Blue Stem, and a hybrid 



between the two. . . _ .. . . 21 



10. Yields in grams of Fife. Blue Stem, and hybrid plants alter further 



selection _ . . ._...._. . . 22 



11. Yields in bushels of 10 new strains of wheat ... 23 



12. Graphic score card comparing wheats . 26 



13. Scheme of jilanting wheat in field crop nursery 45 



14. Method of preserving record sheets .._.._ .....--,. 49 



15. The spikes, flowers, and seeds of wheat. .. . ... 51 



l''«. 0[>eMiug of wheat flowers and anthers . . 52 



1 '. . Removing the flowers of the smaller and later spikelets . 53 



1 N. Opening the floret to remove the anthers 53 



1 '■). Gi'aphic expression of the results of an experiment 57 



20. Floral organs of timothy 62 



21. Flowers of flax - 70 



6 



