43 
Dutch (white) clover wherever they travel. Where 
bullock teams traverse, and along tracks where cattle are 
driven to market, clover and rye-grass spring up. Cattle 
from the Maneroo country carry clover and also the 
portulac of Central Australia (brought, most probably, 
from New England). 
The introduction of foreign animals into Australia will, 
perhaps, influence the character of the country more indi¬ 
rectly than directly. The vegetation of vast tracts will 
be changed by the seeds distributed by them in their 
wanderings. 
Geology. 
The observations made during our journey have 
enabled us to correct some inaccuracies in the geological 
maps of the colony, and to indicate several new and 
interesting features in the rock formations. 
The road from Melbourne to Dandenong is, throughout, 
over upper tertiaries, consisting of beds of coarse white 
and reddish-brown sands, in places consolidated, similar 
to those through which the railway from Melbourne to 
Brighton is cut. 
At Dandenong we touched the great mass of ternary 
granite, which extends thence easterly for sixty-five miles 
to the watershed of the Thomson. 
On our road to Berwick we observed a patch of upper 
Silurian rock not shown on the geological maps, which 
appears to belong to a low range, in part covered by 
newer tertiaries, extending from the southern boundary 
of the granite to the north-western shores of Western 
Port Bay. It is, in fact, the remains of an old spur which 
