24 J.D. Hooker, Introductory Essay to the Flora of Tasmania. 
29. It remains then to examine whether, supposing the glacial { 
epoch of the northern and southern hemispheres to have been | 
suggested as an hypothesis that the presence of so many Arctic- 
American plants in Antarctic America might be accounted for | 
perate zone ;* and there are some facts in the distribution of spe- 
cles common to the mountain floras of the Himalaya and Malay — 
* The continuous extension of so many species along the Cordillera (of which : 
detailed evidence is given in the Antarctic Flora) from the Rocky Mountains to 
uegia, 1s a most remarkable fact, considering how great the break is between the 
Andes of New Granada and those exico, and i ies 
as many Arctic species advance south to the Mexican Andes, but do not cross thé 1 
intermediate depression and reappear in the Bolivian Andes, q 
eet. 
