MARINE BIOLOGY— WINTER QUARTERS, 
1911-1913 
By E. W. Nelson 
Before the collections have been examined it is difficult 
to say much about scientific results. The following is 
a very brief account of the biological work undertaken 
from the Cape Evans shore station during the two years 
the Expedition wintered there. 
In the late summer of 191 1 a trip was made across 
the Barne Glacier to Cape Royds. 
The lakes in the vicinity of Sir Ernest Shackleton's 
winter quarters were covered with only a very few inches 
of ice, showing that, with the exception of Blue Lake, 
they had thawed out that summer. Clear Lake was 
tow-netted by cutting a long slit in the ice and dragging 
the tow-net backwards and forwards. Small catches were 
obtained containing chiefly unicellular algiE and protozoa. 
A few rotifers were caught, but no specimens of the blood- 
red species Philodina gregoria^ found in such quantity 
by Mr. Murray, could be discovered. The masses of 
filamentous algae described by him are a constant feature 
of any lake frozen or thawed. Contrary to our expecta- 
tion none of the larger lakes thawed out again during our 
stay. 
