RECOMMENDATIONS. 
55 
thrive , or which have become or are becoming extinct ; with 
such remarks as may be useful towards determining the con¬ 
nexion which there may be between the habitats of particular 
plants, and the nature of the soil and the strata upon which they 
grow; with statements of the mean winter and summer tempe¬ 
rature of the air and water at the highest as well as the lowest 
elevation at which species occur, the liygrometrical condition 
of the air, and any other information of an historical, oeconomi- 
cal, and philosophical nature. 
Note. If upon this plan a complete botanical survey of the 
British islands could be obtained, the results would be im¬ 
portant when the Flora in the aggregate came to be com¬ 
pared with its relations of soil, climate, elevation, &c. 
