[53] Girls average ½ pound lighter than boys during first year; then 1 to 2 pounds lighter until 12 years; 2 to 3 pounds heavier until 14 years, then lighter.
[54] From the Ninth Yearbook of the National Society for the Study of Education, by courtesy of the author, Doctor Thomas D. Wood. (Data are based upon examinations, during fourteen years, of pupils in Horace Mann School, New York City.)
[55] Holt.
[56] Uffelmann, quoted by Holt.
[57] Vierordt, quoted by Holt.
[58] In the United States the rate in the registration area, according to the Census of 1910, was 124 per 1,000, a total of 159,435, from which the Census Bureau estimates the total deaths for the entire country as 300,000 under 1 year of age.
[59] Before vaccine was generally used, was as prevalent as tuberculosis.
BIBLIOGRAPHY
The following annotated list has been carefully selected, the purpose being to include the most valuable and indispensable books, those that readers will find positively and constructively helpful, and that amplify or illustrate the principles taught in this volume. Many helpful books are necessarily omitted for lack of space.
It is usually impossible to say that any one book is the best on its subject. One book will be better than another for individual readers, according to their individual experience, training, environment, and problems. In the main, the publications listed are of approximately the same caliber as the present Manual. In the list of periodicals, note is made of those that are official publications of organizations. By including in the description of each book the year of publication, number of pages, price, and whether illustrated, the reader has some further clue to its character. Books including a bibliography are usually more systematic and scientific than those without such a list. The dates given are those of latest edition or translations, to 1916. Prices quoted are net, and do not include transportation.