icts | 6,924 | 19.1
-----------------------------+-------------+--------------
Total | 36,246 | 100.
-----------------------------+-------------+---------------

The exact character and extent of the segregation of the Negro
population may be clearly seen from diagrams of this Harlem district,
and of the "San Juan Hill" district in the West Sixties, based upon
the latest figures of the Census of 1910. This is given in Diagrams
III and IV (pp. 50-51)[42]

With such a distribution of the clearly segregated Negro population,
the representative character of the 2,500 families chosen for closer
study becomes evident. These families, from figures based upon the
original returns of the New York State Census of 1905, were chosen
from the Eleventh, the Nineteenth, the Twenty-third, and the
Thirty-first districts. The last district was taken in preference to
several which contained larger numbers, because it included certain
streets that were typical of the Harlem section.

[Illustration: Diagram III:
DISTRIBUTION OF THE NEGRO POPULATION OF HARLEM
Corrected To June 1911]

[Illustration: Diagram IV:
DISTRIBUTION OF THE NEGRO POPULATION ON "SAN JUAN HILL"]

In all 2,639 families were tabulated. Of these 95 were excluded
because the heads of these families were of the professional or
business classes, 37 because they were too incompletely reported, and
7 because the heads were white. This reduced the number to 2,500
families, which consisted of 9,788 persons, exclusive of 17 white
members of these families. The data from the State Census schedules of
enumerators were tabulated in regular order as reported by them for
each block or part of block for the Negro families that were
designated as living in that street or block.

The families studied were from the following territory: Within the
Eleventh Assembly District, the area bounded by Thirtieth and
Thirty-eighth streets, Seventh and Tenth avenues; within the
Nineteenth Assembly District, Sixty-first, Sixty-second, and
Sixty-third streets, between Amsterdam and Eleventh avenues, commonly
called "San Juan Hill;" within the Twenty-third and Thirty-first
Assembly Districts, One Hundred and Thirtieth and One Hundred and
Thirty-third streets between Eighth and St. Nicholas avenues, and One
Hundred and Thirty-fourth and One Hundred and Thirty-fifth streets
between Fifth and Seventh avenues. These three segregated