Produced by Turgut Dincer and the Online Distributed Proofreading Team at http://www.pgdp.net (This book was produced from images made available by the HathiTrust Digital Library.) This is a new sort of book, and unique. That is why I look upon the permission to write a brief preface for it as a rare privilege. Writings on children are frequent. When, in 1875, I contributed, for Karl Gerhardt’s immense _Handbuch_, my _Hygiene of the Child_, I quoted seven hundred treatises or pamphlets on that subject. There are now at least seven thousand of the kind, and the number of text-books on the diseases of children and infants do no longer lead a pardonable, rarely a laudable, existence. A few mon…
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