Searchlights on Health: The Science of Eugenics

by B. G. Jefferis; J. L. Nichols

DURATION OF PREGNANCY

Jan. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Oct. 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Jan. 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Oct. 23 24 25 26 27 28 29 30 31 1 2 3 4 5 6 7 Nov.

Feb. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Nov. 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Feb. 16 17 18 19 20 21 22 23 24 25 26 27 28

Nov. 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 Dec.