252 



Subject Index 



17-Ketosteroid excretion, chauycs 

 with age, 12(5-137, 188, 140 ^ 

 sex difference, 139 



17-Ketosteroids, relation to adreno- 

 cortical steroids, 128, 129 



Learning in old people, 41, 215 



experiments in rats, 215-21(5 

 Lebistes, «Towth rate, 29 



life tables, 29 

 Life expectancy, 201-202, 217 



and retirement, 49, 50 

 Life-span of birds, 4 



and delayed maturation, 27, 28. 



29, 30," 201, 204 

 and eclampsia, 205 

 of liamsters, 181 

 and heredity, 27, 238-241 

 of naturalists, 52 

 and nutrition, 18(5-193, 194-199. 



202, 203, 204, 205, 20(j 

 psychological fa cto rs i n H ue nc i n <> 



52 

 of rats, 179 



retention of teeth and, 13, 242 

 of sea anemones, 244 

 oi Tokophn/fi, 187, 191 

 Life tables, 7, 8, 9, 10 



in Drosophila, 239, 240 

 in Lebistes, 29 

 Lipid content of aortic membrane, 



74,78 

 Literary achievement, 39, 40. 49, 



50 

 Longevity, see Life-span 

 Longitudinal studies 38, 48, 49 



204 

 Lung function, changes with age, 

 58-65 

 sex difference, (J8 

 volume, age changes, 58, 59, 00, 05. 

 GO, 08 

 Lungs, ageing effects of lowered O2 

 partial pressure, 08 

 blood flow, 07 



efficiency in man and animals, 08 

 vital capacity, 58, 59 (50 



Maternal age, importance, 147, 238- 

 241 



Maturation, definition and criteria, 

 201, 202 



delay and life-si)an, 27, 29, 30, 201 

 early, as cause of ageing, 194-199 

 nutrition on, 30, 189-190, 194-199, 

 203, 206 



Maturity, sexual, and life-span, 29, 



30, 203 

 Maze experiments in rats, 215 

 Measurement of cerebral function, 

 51 

 of senescence, 4-14, 24 

 Melancholia, involutional, 44 

 Membrane permeability, age 



changes, 09-75, 70, 77, 78, 79 

 Memory in age, 40, 41 

 ex})eriments in rats, 215 

 tests after steroid administration, 

 137, 138 

 Menarche, onset as criterion of 



maturity, 202, 203 

 Menstruation, restoration after 



cessation, 144-145 

 Mental aspects of ageing, 32-48, 

 50, 51, 52, 215 

 disorders in aged, 44-40 

 patients, adrenocortical activity, 

 219-230, 237 



use in ageing research, 183, 184 

 Metabolic balance studies after 



ACTH administration, 139 

 Mice, starved, analysis of tissues, 208 

 usefulness in ageing research, 177- 

 178 

 Mitral stenosis, CO uptake in, 00 

 Monkeys, duration of reproductive 

 life, 145-140 

 usefulness in ageing research, 182 

 Morbidity in elderly, 10-23 

 Mortality, l)irds, 4 



force of, 8, 9, 10, 12, 14 



Muscle function after steroid 



administration in aged, 137, 138 



power as measure of senescence, 



Musical achievement of aged-, 40 



Natural death, 10, 20 



Naturalists, life-span, 52 



Nervous disease, incidence in aged, 



20 

 Nutrition and delay of sexual 

 maturity, 203 



on life-span, 180-193, 194-199, 202, 

 203, 204, 205, 200 



on life of cell, 191, 192 



neglected areas of research, 173-185 



Obesity on life-span, 194, 195, 203 

 Oocytes, life-span, 142 



neogenesis 172 

 Oogenesis, 147-149, 172 



