FLORA, 221 
really in the north that we find the cradle of this genus 
also. There, after their birth, the Sequotas multiplied 
themselves, and after a first diffusion of their cretaceous 
species, the tertiary polar flora shows us, under forms 
differing little from the preceding, that these spread 
themselves in their turn, and invaded the whole northern 
hemisphere, until the time when there began to be a 
definite decline of the group. It is known that in our 
days there do not exist any other indigenous Sequoia than 
those of California, represented by two species reduced to 
a most restricted area of habitation, the last vestiges of a 
long train of forms aud of subtypes.’ 
Similar details are given in regard to representatives of 
the several orders of pines, firs, cypresses, and poplars 
found there in the lower cretaceous deposits; and in a 
similar way are treated remains found in the upper 
deposits, including a genus Dewalquea, which represents in 
a prototypic state the Hellebores of the present. And 
having given details of specimens found in Bohemia and 
found in Dacota and Kansas, he goes on to say :— 
‘If we transport ourselves into Greenland at the epoch 
of the upper chalk, and look upon the collection of 
dicotyledons, passing over the more uncertain forms, we 
see that this large class comprises everywhere the poplars 
with leathery leaves, Populus Bergrent and P. Hyperborea, 
Heer ; the Ficus, the fruit of which has been recognised, 
and the leaves of which were thick; the galeworts, the 
magnoliads, the Credneria, the arales, the diospyrads, the 
myrtaseas (myrtophyllum), and lastly, the leguminosae. 
One sees also that certain families inevitably reappear at 
this epoch. Let one place himself in Bohemia, in Kansas, 
or in Greenland, &c., and the effects of latitude, so far as 
‘they make themselves appreciable, find themselves still 
restricted within the narrowest limits. The frequency of 
poplars, the absence of laurineae with persistent leaves, 
and the presence of one laurineae with caducous leaves, 
‘still doubtful, it is true (Sassafras arctica, Heer)—such are 
