F - December.
G - January.
H - February.
I - March.
J - April.
K - May.
L - June.
M - Annual death rate.

(_B_) ~Number of Deaths from Typhoid Fever Reduced to
Death Rates per 100,000 Inhabitants per Year.~
==========+===+===+===+===+===+===+===+===+===+===+===+===+====
Fiscal | | | | | | | | | | | | |
year. | A | B | C | D | E | F | G | H | I | J | K | L | M
----------+---+---+---+---+---+---+---+---+---+---+---+---+----
1896-97 | 35| 65|109|109| 78| 70| 56| 17| 17| 17| 26| 39| 53
1897-98 | 43| 69| 78| 43| 39| 78| 31| 17| 8| 38| 25| 85| 46
1898-99 |102| 93| 93|119| 89| 68| 42| 17| 29| 25| 12| 26| 59
1899-1900 | 37|158|125|116|112|108| 69| 24| 33| 41| 20| 49| 74
1900-01 | 82|167|118|102|114| 69| 28| 8| 32| 8| 16| 40| 65
1901-02 | 64|132|112| 84| 88| 64| 75| 31| 47| 35| 51| 35| 68
1902-03 | 83|153| 98|126| 75| 79| 35| 19| 35| 23| 23| 12| 63
1903-04 | 66|100| 69| 73| 31| 54| 19| 19| 23| 38| 30| 30| 46
1904-05 | 61| 83| 95| 53| 42| 34| 41| 4| 19| 26| 4| 11| 39
1905-06 | 56|111| 85| 97| 52| 22| 22| 15| 18| 15| 36| 33| 47
1906-07 | 69|105| 69| 82| 56| 13| 24| 20| 13| 20| 24| 7| 42
1907-08 | 35| 64| 60| 67| 39| 25| 14| 4| 4| 28| 28| 11| 32
1908-09 | 53| 45| 80| 60| 56| 45| 56| 28| 10| 28| 24| 24| 43
1909-10 | 42| 42| 60| 42| 42| 7| 11| 14| 24| 17| 17| 14| 28
----------+---+---+---+---+---+---+---+---+---+---+---+---+----
Average | | | | | | | | | | | | |
monthly | 59| 99| 89| 84| 65| 53| 38| 24| 22| 26| 24| 30|...
death | | | | | | | | | | | | |
rate. | | | | | | | | | | | | |
==========+===+===+===+===+===+===+===+===+===+===+===+===+====

[Footnote 1: Filtered water supplied since October, 1905.]

[Illustration: ~Figure 3--Washington Aqueduct, D. C., Filteration
Plant. Sand Handling, System.~]

[Illustration: ~Figure 4--Washington Aqueduct, D. C., Filtration
Plant. Washer Sand-Handling, System.~]

[Illustration: ~Figure 5--Washington Aqueduct, D. C., Filtration
Plant. Ejector Sand-Handling, System.~]

~Table 10--Periods of Operation, and Quantities Filtered.~
=============+=============+============================================
| Number of | ~Number of days since previous~:
| filter runs +-