X THE STORY OF THE LIVING MACHINE. 



FIGURE PAGE 



29 and 30. Stages in cell division . . . . .98 



31 and 32. Latest stages in cell division .... 100 



33. An egg 103 



34 and 35. Stages in the process of fertilization of the 



egg .......... 104 



36 and 37. Stages in the process of fertilization of the 



egg 105 



38, 39, and 40. Stages in fertilization of the egg . . 106 



41 and 42. Latest stages in the fertilization of the egg . 109 



43 and 44. Two stages in the division of the egg . . in 



45. A group of cells resulting from division, the first step 



in machine building ...... 135 



46. A later step in machine building, the gastrula . .135 



47. The arm of a monkey ...... 144 



46. The arm of a bird ....... 144 



49. The arm of an ancient half-bird, half-reptile animal . 144 



50. Diagram to illustrate the principle of heredity . .156 



