28 INTRODUCTION. 



On the vegetable changes, by which plants are lost 

 from their former localities, and the efforts constantly 

 making by nature to colonize and renew, as well as 

 other curious circumstances in the appearance of 

 plants, and their wanderings about, I shall have 

 occasion to revert hereafter. 



The geographical distribution of British plants, 

 though very interesting to the botanist, does not 

 come within the scope of my present design ; it is, 

 of course, suggestive in its application to the floras 

 of adjacent countries, and the original dispersion of 

 plants. Those who wish to study this subject in 

 detail can refer to the works of Mr. H. C. WATSON? 

 who has written largely upon it. 



