It is frequently assumed, as we have seen, that the process by which civilization is thus evolved is a selfish and immoral process. To procreate large families, it is said, is unselfish and moral, as well as a patriotic, even a religious duty. This assumption, we now find, is a little too hasty and is even the reverse of the truth; it is necessary to take into consideration the totality of the social phenomena accompanying a high birth-rate, more especially under the conditions of town life. A community in which children are born rapidly is necessarily in an unstable position; it is growing so quickly that there is insufficient time for the conditions of life to be equalized. The state of ill-adjustment is chronic; the pressure is lifted from off the natural impulse of procreation, but is increased on all the conditions under which the impulse is exerted. There is increased overcrowding, increased filth, increased disease, increased death. It can never happen, in modern times, that the readjustment of the conditions of life can be made to keep pace with a high birth-rate. It is sufficient if we consider the case of English towns, of London in particular, during the period when British prosperity was most rapidly increasing, and the birth-rate nearing its maximum, in the middle of the great Victorian epoch, of which Englishmen are, for many reasons, so proud. It was certainly not an age lacking in either energy or philanthropy; yet, when we read the memorable report which Chadwick wrote in 1842, on the _Sanitary Condition of the Labouring Population of Great Britain_, or the minute study of Bethnal Green which Gavin published in 1848 as a type of the conditions prevailing in English towns, we realize that the magnificence of this epoch was built up over circles of Hell to which the imagination of Dante never attained.