xii GROWTH 



Fig. Page 



32. Growth in linear dimensions of Jersey cattle. 50 



33. Growth in weight of the dairy cow. 51 



34. Growth as a function of the mature weight in rats. 52 



35. The theoretical curve of Robertson's cycle. 53 



36. The change in velocity of growth of the white rat with age. 54 



37. Growth data of the rat plotted on arithlog paper beginning 13 days 



after conception. 5 5 



38. Growth data of the rat plotted on arithlog paper beginning 22 days 



after conception. 56 



39. Relative rates of growth plotted against age. 57 



40. Time curves of oxidation of linseed oil. 60 



41. Comparison of growth curves of rat, yeast, maize, oats, and squash. 61 



42. Comparison of growth of man and animals. 62 



43. The relation between the rapidity with which the mature weight is 



reached and duration of life. 63 



44. A diagram of the protein molecule. 68 



45. Histidine is an essential amino acid. 71 



46. Zein lacks tryptophane and lysine. 72 



47. Growth on diets almost free from preformed fat. 74 



48. Growth on diets almost free from preformed carbohydrates. 75 



49. Growth on a diet practically free from both fats and carbohydrates. 76 



50. 51, and 52. Growth on diets low in various salts. 82 



53. A typical case of avian polyneuritis. 85 



54. Avian xerophthalmia. 87 



55. Control of rickets by cod-liver oil. 89 



56. Compensation for slow growth by lengthening the growing period. 1 02 



57. Retarded growth due to underfeeding followed by rapid growth 



on refeeding. 103 



58. A short period of underfeeding beginning at birth preventing the 



attainment of normal adult size. 1 05 



59. Permanent suppression of growth by underfeeding begun at wean- 



ing time. 105 



60. Early stages of morphogenesis. 1 1 1 



61. Early stages of the human embryo. 113 



62. Later stages of the human embryo. 116 



63. Changes in form and proportion of the human body during fetal 



and postnatal life. 1 1 8 



