Lawrence, and the third extends through the middle and reaches Canada. We should, therefore, expect that the Flora would be enriched and greatly enlarged by seeds brought and sown along the lines of these great railways and floated to the shores by the waters of the Hudson and Long Island Sound. In this, however, we are disappointed ; for it is remarkable that a very small number of plants are growing in the county, that have been introduced by the means above mentioned.

Of the plants herein enumerated, eighty-eight have been introduced from Europe; fifty-seven of this number are growing without cultivation and freely propagating themselves, and are said to be naturalized ; the remainder, thirty-one in number, are growing without cultivation, but are not fully established.

As already stated, there has been detected in the county 1.142 flow, ering plants and forty-six ferns and their allies. Of the flowering plants, fifty are first-class trees, reaching a height of thirty feet and upwards ; thirty-four are second-class trees which attain a height of fifteen to thirty feet ; and sixty-nine are shrubs, all of which are growing without cultivation, a very few of which have been introduced.

The author would again call attention to what was stated in the beginning of this introduction, viz: all the plants named in this report are known to be growing within these limits without cultivation.

INTRODUCTION.

By including hardy trees and shrubs which have been introduced, and are growing in planted grounds, the list would be very much enlarged-