General Index 



Insects, 57, 92, 96 ff., 112-13, 143, 



146 ff. 

 social, evolution of, 38 

 Integrating systems, 141, 187 

 Invertebrates, 40, 46, 54-7, 79 ff., 



' 112 ff, 143 ff. 

 Involution, 5 

 Irreversibility, of cell-differentiation, 



11 

 Isopods, 92 

 Isoptera, 57 



'June Yellows', 120 

 Juvenile hormone, 147, 185 



Ketosteroid excretion, levels, 1 72 ff. 



Lamp bulbs, failure rate, 33 



Lamprey, 69 



Land, migration of vertebrates to, 12 



Lapwing, 109, 110 



Larvae, insect, senescence in, 146-7 



Lepidoptera, 44, 57, 98, 132, 146-7 



Leukaemia, in mice, 126 



Life, individual, prolongation of 



human, 191 ff. 

 Life-tables, 21 et passim 

 Limpets, 106, 107, 112 

 Literature, reviews of, 4 

 Litter size, decline of, 177 

 Liver, regeneration of, 155-6 

 Lizards, 52, 110-11 

 Lobsters, 92 

 Locust, 18, 44 

 Longevity 



of amphibia, 52-3 



of birds, 49-50 



as evolved adaptation, 80 



of fish, 53-4 



human, 59 ff 



inherited factors in, 121 



of invertebrates, 54-9 



of mammals, 46-9 



maximum, 45-6, 48-9 



physiological and ecological, 24 



of reptiles, 51-2 



Loris, 180 

 Luths, 52 



Macaw, 50 



Mackerel, 111 



Males, preponderant mortality in, 



130 ff. 

 Malnutrition, in man, 151 

 Malthusianism, 192 

 Mammals, growth cessation in, 

 153 ff. 



longevity of, 46-9 

 Man 



heredity and longevity, 122 ff. 



higher male mortality in, 1 33 



maximum life-span, 59 ff. 



prehistoric, 112 



primitive, and old age, 193-4 



specific size in, 12-13 



'wild' mortality patterns in, 111 

 Material, experimental 



choice of, genetic, 136-7 



supply of, 198 

 Maternal age, effects, 91, 125 ff. 

 Mating 



effect on longevity, 99, 132, 133 



test, 31, 32 

 Mechanical senescence, 34-5, 92, 



97, 163 

 Menopause, 36, 177-8, 180-1 

 Metabolic decline, 9-10, 32-3 

 Metabolic theories, 9-10 

 Metabolites, accumulation, 35, 154 

 Metamorphosis, insect, 146 ff. 

 Metaplasm, 7, 32 

 Metathetely, 147, 187 

 Metazoa, senescence of, 9 

 Methionine, uptake rate, 129 

 Methylcholanthrene, 118, 126 

 Mictic females, rotifers, 86, 90, 91 

 Milk yields, 26 

 Minnows, 70, 133 

 Minot's Law, 30 

 Mitosis, 167 ff. 



in arthropods, 92, 96 

 Molecules, catalytic, genes as, 164 

 Molluscs, 20, 36, 58, 102-8 



249 



