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248
CAR I. SKOTTSBERG
the command of Dr. J. G. Andersson, remained from the 23d
November till the 28th December in the waters round the
Louis-Philippe-penin-sula. Now we got a collection that would have been quite satisfactory
for the purposes of a good account of antarctic marine plant-life, but
which was unhappily lost with the ship. A few remnants, and the
observations noted down may serve now for a description, rather scant
and lacking in fullness of detail.
The places visited by us and belonging to the Antarctic proper1
were: the South Shetland Islands, the coasts of the
Louis-Philippe-peninsula, the Palmer archipelago (Trinity Island &ca) Ross Island and the
neighbourhood of Snow Hill.
The influence of external factors.
The factors, which may exercise an influence upon marine
vegeta-tation are: — the nature of the coast (kind of röck, configuration), the
kind of bottom, the temperature, salinity and movements of the sea,
the tides, ice, the light and perhaps also the temperature of the air.
The geological character and configuration of the coast
is briefly the following. The South Shetland and South Orkney
Islands as well as the west coast of Graham Land belong to a series,
called by Dr. Andersson »Region of folding and of Andine eruptives ,
composed generally of more or less hard rocks. The coast ist rocky
and bordered with numerous small islands. The inland ice generally
extends down to the water. Owing of the nature of the coast it does
not produce icebergs, but crumbles on the rocks. In places where the
ice leaves the beach free we often find numerous waterpools and
basins. The outlying islands give shelter and the vegetation is therefore
comparatively rich.
Round the Crownprince-gustavus-Channel on the east side of
the country is found the »Ross-Island-formation», consisting of basaltic
tuffs and lavas. For the most part this is the formation of the coast,
but in several places we have found another formation underlying it
and called Snow Hill-Seymour I.-series , consisting of soft sandstone.
1 Compare C. Skottsberg : Some remarks upon the geographical distribution of
the vegetation in the colder Southern Hemisphere (Ymer 1905, H. 4. Stockholm).
2 J. G. Andersson: On the geologv of Graham Land. (Bull, of the Geol. Instit.
of Upsala, Vol. VII. 1906).
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