LIST OF ILLUSTRATIONS 



Swedish Select Oats Frontispiece 



FIGURE PAGE 



1. Cereal seedlings showing the nature of the coronal roots 



(Boettcher) 4 



2. Part of cross-section of a culm of wheat (Shull) ... 5 



3. Part of cross-section of a wheat leaf (Shull) ... 6 



4. Cross-section of a wheat kernel (Chambers) ... 10 



5. A part of section in Fig. 4 further enlarged (Chambers) . 11 



6. Cross-section through the embryonic part only of a wheat 



kernel (Chambers) 13 



7. Seedling of Kherson oats, showing roots from two different 



crowns (Boettcher) 16 



8. Wheat seedling showing shoots from two different crowns 



(Boettcher) 17 



9. a. Longitudinal section of a barley kernel (Harlan). 



6. Photomicrograph of the scutellum of a germinating barley 



kernel, showing the epithelial layer (Harlan) . . 20 



10. Turkey wheat plant, showing roots 7 feet long (Cardon) . 30 



11. Spikelets of wild emmer and Black Winter emmer (Derr) . 33 



12. Spikes and kernels of two varieties of common wheat . . 36 



13. Spikelet and kernels of common wheat (Boettcher) . . 37 



14. Spike, spikelet, and kernels of Club wheat (Boettcher) . 45 



15. Spike, spikelet, and kernels of Poulard wheat (Boettcher) . 48 



16. Spike, spikelet, and kernels of Durum wheat (Boettcher) . 52 



17. Spike, spikelet, and kernels of Polish wheat (Boettcher) . 57 



18. Spike, spikelet, and kernels of spelt (Boettcher) ... 59 



19. Two varieties of spelt in the field (Derr) .... 60 



20. Spike, spikelet, and kernels of emmer (Boettcher) . . 63 



21. Spike, spikelet, and kernels of einkorn (Boettcher) . . 66 



22. Map of the United States and Canada, showing wheat 



districts (Stevenson) ....... 68 



23. Field of Durum wheat (E. M. Freeman) .... 78 



