Excerpt from Population Since the immigrant element under 20 years of age is proportion ally quite the larger or smaller number of persons under 20 years may be easily explained by the number of births in those years, from which these classes under 20 years are obtained, and the accuracy of this explanation becomes the more prob able asthe classes observed are younger.
As neither the census of 1870 nor that of 1880 gives the statistics of births, the foregoing statement as to the influence of the war and panic is, of course, only a supposition, but one which gains strength because supported by the experience of other countries During the period of the franco-german war the number of births was percept ibly interrupted; while at the same time the interesting fact was oh served that the increase in the number of conceptions began not with the actual return of the troops but immediately after the sus pension of hostilities and the conclusion of peace.'l' Thus the effects of the war were manifested not only by the withdrawal of a portion of the male population, but also by the psychological and economical effects produced upon the part of the people remaining at home.
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