‘ 
J.D. Hooker, Introductory Essay to the Flora of Tasmania. 321 
of Tasmania, the Banksia cones of Victoria (which seem identi- 
cal with those of B. ericifolia, though buried under many feet o 
). The leaves of the calcareous tuffs on the banks of the 
Derwent,* etc., appear however to belong to a different and 
warmer period. 
From the above it would appear that the extinct flora of Aus- 
tralia was not entirely different from that now existing, and, 
_ following Mr. Jukes’s line of argument, that Australia continued 
_ asdry land during the European Oolitic and Cretaceous periods. 
At this epoch Mr. Jukes assumes that the peculiar flora of Aus- 
} ia was introduced, and that the continent was again sub- 
_ merged during the Tertiary epoch, when it presented the ap- 
earance of two long islands, or chains of islands, one, the 
_ larger, representing the elevated land of eastern Australia and 
zu nia, the other that of southeastern Australia, together 
‘™ peediary groups in the western and northern parts of the 
«continent, 
u 
a Sandwich groups, where we have the small islands of one 
| Archipelago paola by different species, and even genera. The 
1 
' 
x 
‘hon of varieties into species), tend to enlarge the genera numer- 
| teally within a small geographical limits, and thus 
: a 
Was not altogether specifically different from what it now is, 
Would Bppent trom a aot snoiaedl on by Mr. Jukes, that it was 
ait Banksia I i still one of the commonest trees 
7 pat part ieee cone os the question of where the Bank- 
, ~ their allies were created, an 
vii it’s Journal, p. 535, and Volcanic Islands, p. 140; Strzelecki, p. 254; 
' con Journ., i, 181. 
: ES, Vow. XXIX, No. 87.—MaY, 1860. 
: 4) 
