]]
[Footnote 7: In Philadelphia the streets for the most part cross each
other at right angles and at equal distances, so that the city is laid
out like a checkerboard. The parallel streets running in one direction
have names, often taken from trees. Market Street is the central
street from which the others are reckoned in both directions according
to the couplet
"Market, Arch, Race, and Vine,
Chestnut, Walnut, Spruce, and Pine," etc.
The cross streets are not named but numbered, as First, Second, etc.
The houses on one side of the street have odd numbers and on the other
side even numbers, as is the general custom in the United States. With
each new block a new century of numbers begins, although there are
seldom more than forty real numbers in a block. For example, the
corner house on Market Street, just above Fifteenth, is 1501 Market
Street. At somewhere about 1535 or 1539 you come to Sixteenth Street;
then there is a break in the numbering, and the next corner house is
1601. So in going along a numbered street, say Fifteenth, from Market,
the first number will be 1; after passing Arch, 101; after passing
Race, 201, etc.
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