settlements on this continent has been a source of terror. It
means the making habitable of certain places which heretofore a white
man has entered only at the risk of his life. It means that quarantines
need no longer be established when yellow fever breaks out in a
district; quarantines which have inevitably caused the loss of millions
of dollars to the world of commerce.

RESULTS IN HAVANA

The first practical work based on these findings was done in Havana. The
Yellow Fever Commission made their recommendations in 1900. In 1901 and
1902 they were put into effect. The following table of the death rate
there during a period of ten years shows graphically the results:

DEATHS IN HAVANA FROM YELLOW FEVER

-----+------+------+------+------+------+------+------+------+------+------
| 1893 | 1894 | 1895 | 1896 | 1897 | 1898 | 1899 | 1900 | 1901 | 1902
-----+------+------+------+------+------+------+------+------+------+------
Jan. | 15 | 7 | 15 | 10 | 69 | 7 | 1 | 8 | 7 | 0
Feb. | 6 | 4 | 4 | 7 | 24 | 1 | 0 | 9 | 5 | 0
Mar. | 4 | 2 | 2 | 3 | 30 | 2 | 1 | 4 | 1 | 0
Apr. | 8 | 4 | 6 | 14 | 71 | 1 | 2 | 0 | 0 | 0
May | 23 | 16 | 10 | 27 | 88 | 4 | 0 | 2 | 0 | 0
June | 69 | 31 | 16 | 46 | 174 | 3 | 1 | 8 | 0 | 0
July | 118 | 77 | 88 | 116 | 168 | 16 | 2 | 30 | 1 | 0
Aug. | 100 | 73 | 120 | 262 | 102 | 16 | 13 | 49 | 2 | 0
Sep. | 68 | 76 | 135 | 166 | 56 | 34 | 18 | 52 | 2 | 0
Oct. | 46 | 40 | 102 | 240 | 42 | 26 | 25 | 74 | 0 | 0
Nov. | 28 | 23 | 35 | 244 | 26 | 13 | 18 | 54 | 0 | 0
Dec. | 11 | 29 | 20 | 147 | 8 | 13 | 22 | 20 | 0 | 0
-----+------+------+------+------+------+------+------+------+------+------

As long as the United States held control at Havana the yellow fever
was kept in check by fighting the mosquitoes, when this vigilance was
relaxed the fever began to appear again and the Cubans found that it was
necessary to keep up the fight against the mosquitoes if the island was
to be kept free from the disease.

THE FIGHT IN NEW ORLEANS

In the summer of 1905 came another opportunity to put the knowledge
gained during these experiments to a practical test. Samuel Hopkins
Adams in his article in _McClure's Magazine_, June, 1906, says o