The Measurement of senescence 1 24 33 Drosophila subobscura-hybrid vigour and longevity. Survival curves for the inbred lines B and K, and for the reciprocal hybrids between them 128 34 Survivorship curves for 82 males and 45 females of the black widow spider Latrodectes mactans 131 xii Illustrations 35 Survivorship, death and death-rate curves for the black widow. 36 Survivorship curves for male and female Tribolium madens 131 37 Effect of restricted food upon the longevity of Daphnia longispina 38 Effect of restricted food upon the duration of instars in Daphnia longispina 39 Effect of restricted food upon the rate of senile change in the heart rate of Daphnia longispina 40 Survival curves of normal and retarded male and female rats, showing the effect of dietary restriction 41 Neutral 1 7-Ketosteroids, 24-hour urinary excretion of human males 73 42 The postnatal growth in weight of male children 84 43 Annual growth increment in boys, from the data of Quetelet 65

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