XX LIST OF ILLUSTRATIONS 



FIGURE PAGE 



42. A bunching attachment or swather on an ordinary mower . 390 



43. Seeds of red clover : 1, side view and, 2, edge view of seeds ; 



3, the triangular form indicated; 4, a seed cut length- 

 wise ; 5, a seed cut crosswise, showing the embryo ; a, 

 a seed scar ; b, a stemlet (radicle) of the embryo ; c, seed 

 leaves (cotyledons) of the embryo ; 6, a pod of red clo- 

 ver ; 7, natural size of seeds 392 



44. Sketch showing the effect of the clover-seed chalcis fly: 



calyx (a), seed capsule (b), and seeds (c and d). At c 



the mature insect is shown in the act of emerging . . 402 



45. Alsike clover seeds : a, seeds showing variation in form and 



surface appearance, enlarged ; b, natural size of seeds . 409 



46. Sweet clover . .' . . . . . . . . 417 



47. Seeds of sweet clover : a, seeds showing variation in form 



and size ; b, natural size of seeds ; c, a pod of sweet 

 clover . . . ; ]' : . '' . . . ' . . 424 



48. Crimson clover . '' .' " . . . ... .426 



49. Seeds of crimson clover (enlarged and natural size) . . 434 



50. Seeds of yellow trefoil : a, seeds showing variation in form 



and size ; b, natural size of seeds ; c, oval form of tre- 

 foil seeds indicated ; d, a pod of trefoil .... 436 



51. Field pea 442 



52. Seeds of common vetch (Vicia sativa). (Natural size) . 467 



53. Seed soar of common vetch. (Enlarged) .... 467 



54. Types of mottling of seeds of common vetch : a and b, from 



light and dark seeds, respectively. (Enlarged) . . 467 



55. Hairy vetch 468 



56. Seeds of hairy vetch (Vicia villosa'). Natural size . . 476 



57. Seed scar of hairy vetch: a and b, forms showing the white, 



central slit of some scars. (Enlarged) . . . 476 



58. Tangier pea . . 483 



59. Cowpea 492 



60. Soybean . . . . . . . . . .512 



61. Roots of soybean, showing nodules . . . . . 525 



62. Root crops. 1909-1910. Figures equal acres ... . .585 



