62 
VACCINATION. 
Of Cryptogamia this island is proportionally still 
poorer ; four ferns, all at above four hundred feet, a few 
Conferva^ perhaps three or four mosses on the top of 
‘ Monte Verde,’ all without fructification, and Alg^e on 
the sea-coast very sparingly. On the whole, eighty or 
ninety Phanerogamia were collected in flower. Of 
insects, chiefly flies and grasshoppers were found, few 
beetles.” 
Roscher and several of the officers, visited a thin bed 
of lime-stone on the south side of the bay, and which 
abounds in varieties of conuSy buccinium, and murex. 
On the sea-shore this bed lies horizontally six feet above 
the level of the sea ; but it is gradually upraised by tufa 
— cut through by basalt, to the height of forty feet on 
every side. This bed and some few volcanic cones at 
different points of the island, form the chief geological 
subjects of interest. The formation seems to be of the 
older lavas, traversed in all directions by basaltic d}^kes. 
The summits of the mountains are nearly all capped 
with basalt. 
Dr. MacWilliam, senior surgeon of the expedition, 
and Mr. Marshall of H. M. Ship ^ Soudan,’ vaccinated a 
number of the children, thereby preserving them from 
a disease, which once introduced here, commits such 
fearful ravages ; and yet nothing is done by the parent 
Government to introduce or continue such a simple 
process. 
One of our officers started — attended by active guides 
— on a two days’ zoological ramble on the mountains, in 
