352 
cent regions. It was only a few meters in width, and in 1894 
and 1895 it was frequently necessary to clear it of encroaching 
vegetation in order to make feasible the 30-meter oblique haul. 
In high water and generally in years subsequent to 1895 it was 
only necessary to avoid with drawn net or pump the clumps of 
Ceratophyllum which still dotted the bottom in this neighbor- 
hood. The point of collection thus lay at all seasons towards 
the narrowing end of the lake and in the path of the current 
maintained by Quiver Creek and the marginal springs. At 
times of high water it was in the direct path of the downward 
current of impounded backwaters thrust towards the channel 
by the encroaching eastern bluff (PI. IT.). 
At times of flood the invading river waters extend for some 
distance, even to the middle of the lake, crowding the clearer 
lake waters to the eastern side. When the western bank was 
not submerged the backwaters entering by way of the chutes 
sometimes reached the plankton station. Our collections were 
always made in evident lake water unless otherwise stated 
(Table V.). 
The access of creek and spring water, the extensive areas 
of dense vegetation, and the shoal waters, which at all levels 
form the greater part of the area of this lake, all combine to 
make the temperature conditions subject to great local varia- 
tion, and to diversify the fauna and flora indigenous or adven- 
titious in the plankton of this body of water. 
COLLECTIONS, 
Our chronological series in this lake includes 115 collections, 
extending from June 6, 1894, to March 28, 1899. The collec- 
tions in the several years number 14, 13, 31, 24, 26, and 7 re- 
spectively. Their distribution by months is shown in the table 
between pages 342 and 343. In the earlier years the interval of 
collection was somewhat irregular, though with 6 exceptions 
every mouth is represented. From July, 1897, collections were 
made at least every fortnight and on the same day as at the 
other stations. The oblique-haul method was used—with a few 
