18 BOTANICAL GAZETTE [JANUARY 
some of the differences between tropical and northern vegeta- 
tion. I shall sum up my apprehension of tropical nature in the 
words that Linné is said to have expressed on Homo sapiens: 
‘Habitat inter tropicos, hospitatur extra tropicos.” Perhaps — 
this saying may be called a true one, remembering that the — 
cradle of mankind most likely was in the rich and luxuriant 
tropical nature ; but I hold it for certain that outside the tropics 
man is not a transient guest. For, admitting the tropics to be 
ever so rich in species, types, flowery pride, and fragrance, and 
admitting it to be ever so easy for man to procure maintenance 
of life in this rich nature (and surely it is this Linné has had in 
view), we must say that outside the tropics, in our temperate 
climates, man has found his most charming ome, and just 
here he develops himself supremely in intelligence, morality, 
and strength of character. 
UNIVERSITY OF COPENHAGEN. 
