—_=— 
13 
of 1895 a plankton station had been established in the west 
arm of Quiver Lake, known as Dogfish Lake. Wxaminations 
were continued in this locality for two years at intervals of a 
month or less, but were discontinued in July, 1897. During 
much of the year the conditions at this station differed but 
shghtly from those in Quiver Lake. Vegetation is a trifle more 
abundant and its duration is more extended. Except at times 
of high water there is no current passing through this arm of 
the lake. The difficulty of access to this station at times of low 
water—due to the dense mat of Ceratophyllum through which 
the plankton boat must be rowed—were increased by the erec- 
tion of a fence of wire netting across the mouth of the lake in 
the construction of a fish pound. In view of the similarity to 
Quiver Lake and the difficulty of access, it seemed desirable to 
drop this station from the regular list, especially as the two 
years’ collections of its micro-flora and micro-fauna will suffice 
for detailed comparison with the plankton of the main body of 
the lake. 
Monthly plankton collections were made in Thompson’s 
Lake during the first half of 1897, but in July of that year a 
fortnightly interval was adopted and has since been maintained. 
This station is, next to the river, the most important one on our 
list, being located in the largest permanent body of water within 
the field of our operations. During the period of high water 
(three to four months of the year), it is of easy access, as it 
is possible at such times to run the launch through the ‘cut 
road” across the bottomlands to the south end of the lake. As 
the water falls access may still be had for some time with a row 
boat through the ‘‘ cut road;” or, at still lower water, through 
the ‘‘swale,” a tortuous channel through the bottomland under- 
brush from the foot of Flag Lake to Thompson’s Lake. When, 
however, the river falls below six feet, the only approach to this 
station is via Thompson’s Lake Slough, a bayou connecting the 
lake with the river, leaving the latter at a point about six miles 
above Havana. Shallow water and a rank growth of aquatic 
vegetation found in some years at the northern end of the lake 
soon render it impossible to enter from the slough with the 
launch, and when the water falls below three feet a mud bar at 
the northern end of the slough necessitates making the remainder 
