Notice of Dr. Hooker's Flora of New Zealand. 347 
fontana, comets verna, Cardamine hirsuta, Epilobium tetragonum, 
and many ot 
On the maa han it must be recollected that there are other causes 
besides antiquity and facility for migration, that determine the distribu- 
me Be : 
regards — the plants mentioned above seem wonderfully i in- 
different to its e 
Again, even shengh we may safely pronounce most species of ubiq- 
uitous plants to have outlived many geological changes, we may not 
rse the position, and assume local species to be a t the 
recently created ; for whether (as has been conjectured) species, like 
individuals, die out in the course of time, foll e inscruta 
law whose operations we have not yet traced, or wh (as in some 
instances we know to be the case) they are destroyed by natural causes 
(geological or others), they must in either case become scarce and lo- 
cal while they are in process of ne pees ee 
In the above speculative review of some of the causes which appear 
to affect the life and range of species in abe vegetable kingdom, I have 
eminent Ceres with those laws that govern animal life also; but 
there is nothing in what is assumed above, in favor of the antiquity of 
Species and their wide distribution, that is inconsistent with any theory 
js their origin that the g pogtnad may adopt. y object has not so 
h been to ascertain w ar or may not, have been the original 
not ear, D 
any means of knowing: if the expression of an opinion ps insisted on, 
Ishould be tid 6 follow the example of an eminent astronomer, 
wits Watson (Cybele Britannica) gives ed yes ihe of Callitriche in Britain alone 
mean nl ar ge of 40° to ascending hee ig level of 
Saret 2000 feet in the East Highlands of Scotland. ~ Mon 
os sa range of $ and mabey to 3300 feet seat 
sacs 
of 40° to 51°, and Sts to 2000 
Perature of f° 52°, and ascends to 3000 feet. 
