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INTRODUCTION.

viil goefted to

My inducement to commence this work, after it was fu me by the letters of Sir John Sinclair, was à belief, that the expe- riments and obfervations already made on the growth of plants, with the modern improvements in chemifiry, Were fuficiently numerous and accurate for the eftablifhment of a true theory of vegetation 3 fo much wanted to connect the various faéts in the memory, to ap- preciate their value, and to compare them with each other; and finally to direct the profecution of future experiments to ufeful

purpofes.

PHYTOLOGIA.