xiv ILLUSTRATIONS 



FIG. PAGE 



39. Rate of gain of energy per 1000 pounds live weight . . . 398 



40. Lobule of milk gland .462 



41. Alveoli of milk gland 463 



42. Structure of milk gland . . . . . . . . 463 



43. Partial section of wheat grain 582 



44. Partial section of oat grain . 584 



45. Partial section of maize kernel . . . . . . 588 



