Baldness, 95 causes of, 96 thyroid extract in, 96
Biological aspect of old age, 10, 11, 23, 63
Birth, expectation of life at, 13, 41, 42
Blood, condition of, 108, 115 increase of urea-nitrogen in, 115
Blood pressure, 125 and heredity, 37 high, 55, 124 longevity in relation to, 37 senile, 104, 124, 125
Bodily vigour, sex gland activity as manifestation of, 69
Body, cells of. _See_ Cells conformation of, 60 fibrous framework of, 92 structural changes in, 90 temperature of, 116 water content at birth and adult life, 64
Bones, injuries to, healing of, 126, 127 Paget’s disease of, 156 rarefaction and absorption of, 99 arterial degeneration with, 107
Brain, changes in, 96, 146 degeneration of cells of, 97 organic changes in, 145 senile atrophy of, 139 shrinkage of, 100 weight of, 97
Brain cells, activity of, influence on longevity, 35, 36
Bronchiectasis, simulating tuberculosis, 149
Bronchitis, disposition to, 147 simulating tuberculosis, 149
Bronchopneumonia, 148 and pneumonia, confusion between, 148 tendency to, 103
Calcification, of arteries, 106–107 of cartilage, 100
Calendar, length of, in the patriarchal era, 15
Cambridge University, influence of John Haviland on the study of medicine, 6
Carcinoma, 141 age and sex incidence of, 86, 140 and senescence, 86–89 rarity of, in extreme old age, 87
Cardio-vascular system, 36–38, 103–108, 124, 133, 149
Castration, phenomena of old age and, 79 secondary sex-characters following, 79
Cell-memory, 35 longevity in relation to, 35
Cells, 62 activity of, relation to connective tissues, 68, 88, 89, 92 ageing of, 67, 88 carcinoma in relation to, 86–89 causes and significance of, 67 senility in relation to, 86, 88 changes in, infections causing, 43, 44 changes in old age, 64 colloidal changes in, 64, 68 cultivation of, 66 degeneration of, 62, 92, 135 intestinal bacteria causing, 82, 83 infections and intoxications producing changes in, 44 life cycle of, 63, 65, 88, 89 factors influencing, 65 on what dependent, 68 thyroid deficiency influencing, 72 limited vitality of, 62 sequels of, 64 products inimical to life of, 65 senile changes due to injury to, 30, 31, 67 time-rate of, 36 vital phenomena of, 63, 88, 89
Centenarianism, 19 heredity in relation to, 19