In 1881, the first edition of Professor Preyer’s “model record” was published, and before his death, in 1897, it had reached its third edition in Germany, and had been widely circulated in America in Mr. Brown’s excellent translation, “The Senses and the Will,” and “The Development of the Intellect.” It did more to stimulate and direct the study of infancy than any other publication. It has, however, the limitations that were to be expected from Professor Preyer’s special training as a physiologist, and is meagre on the side of mental, moral, and emotional development. Professor Sully’s “Extracts from a Father’s Diary,” published in part in 1881 and 1884 and fully in 1896, is richer on these sides, and also more readable. Within the present decade, it is worth observing, the principal records have been American, not German, and have been written by women. Outside of America, only men, usually university professors, have made extended records. Professor Preyer and Professor Sully have both appealed in vain to their countrywomen to keep such records, holding up American women for emulation. My “Notes on the Development of a Child” were published in 1893 and 1899. In 1896 appeared Mrs. Hall’s “The First 500 Days of a Child’s Life,” a brief record, and confined to a short period, but a very good one, and perhaps the best for use as a guide by any one who wishes to keep a record and finds Preyer too technical. Mrs. Moore’s “Mental Development of a Child” is quite as much a psychological study as a record, but is based on full biographical notes; it will be more used by students than general readers. Mrs. Hogan’s “A Study of a Child,” 1898, is less scholarly than the others, but has a great deal of useful material; it does not begin at birth, however, but with the fourteenth month. Perhaps I should say a word here as to the way in which I came to make a baby biography, for I am often asked how one should go to work at it. It was not done in my case for any scientific purpose, for I did not feel competent to make observations of scientific value. But I had for years desired an opportunity to see the wonderful unfolding of human powers out of the limp helplessness of the new-born baby; to watch this fascinating drama of evolution daily, minutely, and with an effort to understand it as far as I could, for my own pleasure and information. I scarcely know whence the suggestion had come; probably almost by inheritance, for my mother and grandmother had both been in somewhat notable degree observers of the development of babies’ minds. But, unlike them, I had the notebook habit from college and editorial days, and jotted things down as I watched, till quite unexpectedly I found myself in possession of a large mass of data.