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Table 11.-Reported cases of whooping cough, by race and by months, during the calendar

year 1907, with certain data relative thereto.

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TABLE 12.- Ages of cases and deaths from whooping cough during the calendar year 1907.

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1

Under 1 year..

7 17.1 30
4 13.3 11

3

27.2 From 1 to 5 years.

9
5. 7 123

3
2. 4 34

6

17.6 From 5 to 10 years.

34

15 From 10 to 20 years.

3

1 From 20 to 30 years.

2 From 30 to 40 years.

3 From 40 to 50 years.

2 From 50 to 60 years. From 60 to 70 years.

1
Over 70 years.
Total..
259 16 6.2 198

7
3.0 61

9

16.4 NOTE.-Cases not reported until after April 9, 1907. Table 13.--Reported cases of chicken por, by race and by months, during the calendar

year 1907, with certain data relative thereto.

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NOTE. -Cases were not reported until after April 8, 1907.

Table 13.-Reported cases of chickenpox, by race and by months, during the calendar

year 1907, with certain data relative theretoContinued.

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Table 14.- Ages of cases and deaths from chicken pox during the calendar year 1907.

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TABLE 15.- Reported cases of epidemic cerebro-spinal meningitis, by race and by months,

during the calendar year 1907, with certain data relative thereto.

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Note.-Cases were not reported until after April 8, 1907.

ANALYSIS.

White.

Colored.. Total.

Cases per 100,000...
Percentage of deaths to cases.

2.1
60.00

5.2 100.00

3.0 8.00

Table 16.— Ages of cases and deaths from epidemic cerebro-spinal meningitis during the

calendar year 1907.

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Table 17.-Statement showing the prevalence and severity of diphtheria, scarlet fever,

typhoid fever, smallpox, measles, whooping cough, chicken pox, and epidemic cerebrospinal meningitis during the calendar year 1907, with comparative figures for previous years.

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a Average for 5 years.

Table 18.— Number of cases of typhoid fever reported to the health department during the

calendar year 1907, figured according to the districts shown on the map of vital statistics.

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Table 19.-Statement showing the prevalence of typhoid fever in the District of Columbia,

by months and by years, from July 1, 1902, to December 31, 1907.

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a Shallow wells ordered closed by the Commissioners of the District of Columbia, May 21, 1907.

Filtration of entire water supply begun in October, 1905.

REPORT OF THE CHEMIST.

WASHINGTON, D. C., July 1, 1908. SIR: I have the honor to submit the following report relative to the work performed in the chemical laboratory for the fiscal year ended June 30, 1908.

During the year there were examined a total of 5,627 samples, as follows:

TABLE I.

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Milk.Of the samples of milk examined, 4,228, or 91,27 per cent, were collected about the city; 237, or 5.12 per cent, from the Southern Railway station; 154, or 3.32 per cent, from the Baltimore and Ohio Railroad station; while 33, or 0.28 per cent, were from miscellaneous sources.

Of the samples collected about the city, 637, or 15.06 per cent, contained less than 3.5 per centum of butter fat, and 57, or 1.35 per cent, showed added water; of those collected from the Baltimore and Ohio station and from the Southern Railway station, 15, or 9.74 per cent, and 18, or 11.68 per cent, contained less than 3.5 per centum of butter fat; and 5, or 2.11 per cent, and 3, or 1.26 per cent, respectively, showed the addition of water.

A comparison of this with the three previous years, together with the percentage of samples collected from various sources, will be seen in the following table:

Table II.- Percentage of samples of milk collected from various sources.

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