Torrey, in his report of the Flora of the State, stated that the number of flowering plants would reach 1,450 ; and the Ferns and Lycopodiaceae. sixty.

There will be great reason, then, for wonder, when it is found that the number of plants growing without cultivation in Westchester County -- a territory about fifty miles in extent from north to south, and whose average width from east to west is not half so much -- is more than a thousand.

There are 1,142 flowering plants enumerated in this catalogue, and forty-six ferns and their allies.

The formation of the county is chiefly Gneisic and Limestone rocks. Limestone is sprinkled throughout, but especially along the middle, from north to south. The southern half is divided by two parallel valleys, which trend north and south -- dipping towards the south -- and about three miles apart, separated by a ridge of hills. The valley on the Eastern side of the ridge is drained by the Bronx River, and the other (in part) by Saw-Mill River continued by Tibbitt's Brook. This limited territory has no difference of climate and temperature.

INTRODUCTION.

The soil is made up of abrasions and disintegrations of Gncisic and Limestone rocks and sand, sparingly mixed with clay; forming what agriculturalists denominate "Light Loam" -- a soil especially adapted to the growth of cereals -- yielding abundant crops to generous cultivation. But in such narrow limits, we cannot have a wide range in the variety of soil; in fact, we have very little more than such variety as is produced by Hill and Vale, or wet, damp, hilly and rocky -- which is not so much a variety of soil as a difference in the state of the same soil.