and is highly resistant to insects and disease.

2. Norway maple (_Acer platanoides_)

Very hardy; possesses a straight trunk and symmetrical crown; is
comparatively free from insects and disease and will withstand the
average city conditions.

3. Red oak (_Quercus rubra_)

Fastest growing of the oaks; very durable and highly resistant to
insects and disease; will grow in the average soil of the city
street.

[Illustration: FIG. 93.--Street Trees. Norway Maples.]

4. Gingko (_Gingko biloba_)

Hardy and absolutely free from insects and disease; suited for
narrow streets, and will permit of close planting.

5. European linden (_Tilia microphylla_)

Beautiful shade-bearing crown; is very responsive to good soil and
plenty of moisture.

6. American elm (_Ulmus americana_)

When planted in rows along an avenue, it forms a tall majestic
archway of great beauty. It is best suited for wide streets and