[22] M. G. Mulhall, F. S. S., in North American Review, July, 1897.

[23] Tenth Census, Vol. XI, p. xxxviii.

[24] Dr. John S. Billings’ comments upon Vital Statistics of the Tenth Census, Vol. XI, p. xxxviii.

[25] Pages 53 and 54.

[26] Report of the Health Officer of the District of Columbia, 1896, page 7.

[27] Pages 53 and 55.

[28] Bulletin of the Department of Labor, No. 10, May, 1897, page 286.

[29] Surgeon General’s Report, 1896, Table XII.

[30] Dr. Francis A. Walker, in the Forum, July, 1891.

[31] Page 148.