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CHAP. IV It is difficult to explain the coincidences exhibited by this diagram in any other way, and it is strikingly corroborated by a diagram of infant mortality in London and in England which I laid before the Royal Commission, and which I here reproduce (No. X.). The early part of this diagram is from a table calculated by Dr. Farr from all the materials available in the Bills of Mortality, and it shows for each twenty years the marvellous diminution in infant mortality during the hundred years from 1730 to 1830, proving that there was some continuous beneficial change in the conditions of life. The materials for a continuation of the diagram are not given by the Registrar-Greneral in the case of London, and I have had to calculate them for England. But from 1840 to 1890 we find a very slight fall, both in the death-rate under five years and under one year for England, and under one year for London, although both are still far too high, as indicated by the fact that in St. Saviour's it is 213, and in Hampstead only 123 per 1,000 births. There appear to have been some causes which checked the diminution in London after 1840, then produced an actual rise from 1860 to 1870, followed by a slight but continuous fall since. The check to the diminution of the infant death-rate is sufficiently accounted for by that extremely rapid growth of London by immigration which followed the introduction of railways and which would appreciably increase the child-population (by immigration of families) in proportion to the births. The rise from 1860 to 1870 exactly corresponds to the rise in Leicester, and to the strict enforcement of infant vaccination, which was continuously high during this period; while the steady fall since corresponds also to that continuous fall in the vaccination rate due to a growing conviction of its uselessness and its danger. These facts strongly support the contention that vaccination, instead of saving thousands of infant lives, as has been claimed, really destroys them by thousands, entirely neutralising that great reduction which was in progress from