counteracting the effects of the differential birth-rate. Where infant mortality is highest the average number of children above the age of two for each married woman is highest also, and although the chances of death at all ages are greater among the inhabitants of the poorer quarters, their rate of natural increase remains considerably higher than that of the inhabitants of the richer.
"From the detailed study of the figures made by Newsholme and Stevenson, conclusions essentially the same as those of Heron can be drawn.... Their first step was to divide the London boroughs into six groups according to the average number of domestic servants for 100 families in each. This is probably as good a measure of prosperity as any other. They then determined the total birth-rate of the population in each group, and arrived at the following figures:
| Group | ||
|---|---|---|
| I. 10 | domestic servants for 100 families | 34.97 |
| II. 10-20 | 38.32 | |
| III. 20-30 | 25.99 | |
| IV. 30-40 | 25.83 | |
| V. 40-60 | 25.11 | |
| VI. Over 60 | 18.24 |