SOME BOOKS OF THE WEEK.
The Telephone and Telephone Exchanges, by J. E. Kingsbury (Longmans and Co., 12s. 6d. net), is an historical narrative of the invention and of its development. This narrative in- volves, however, full technical descriptions of the main mechani- cal features of the telephone, as well as a treatment of the commercial and political problems involved in it. We notice from the statistical tables at the end of the volume how extra- ordinarily high is the ratio of telephones to population in the United States compared to that in other countries. In the United States there were at the beginning of 1914, 9.7 telephones per hundred of the population. Nearest to this comes Canada with 6.5. The highest figure in Europe was Da'imark with 4.5, and the other Scandinavian countries ran this figure close. Germany had 2.1, and Great Britain only 11.
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