Juday—Limnological Apparatus. 
577 
is expelled from the net; otherwise the air in the net may 
keep it at the surface of the water. 
The straining cone of the net is made of a good quality 
of rather loosely woven fabric, such, for example, as what is 
known as “India Linen.’ 5 It has a band of heavier cloth at 
the top and also at the bottom where it is tied onto the metal 
parts of the net. Two extra seams along the sides of the 
net form compartments through which the lines supporting 
the bottom of the net pass. (See Plate XXXIV, fig. 4.) 
The funnel that is used in connection with this net is 
shown in fig. 4, C. The straight part of this funnel is 5 cm. 
in diameter and 3.5 cm. long; the cone part has a slant 
height of 4 cm. Extending down from the apex of the cone 
is the straining tube which is 1.2 cm. in diameter, and 8 cm. 
long. The bottom of this tube, a cylinder 1.3 cm. long, is 
attached to the top by means of two strips of folded tin. 
Over the windows thus formed is soldered a cylinder of fine 
brass wire netting 5 cm. long. The diameter of the strain¬ 
ing cylinder is such that it will pass freely into the neck of 
an 8 dram (30 cc.) homeopathic vial, short form. All of 
the funnel except the wire gauze is made of tin. 
In making collections with, this apparatus, several hauls 
are made with the net and the material is washed into a cup 
which is then filled with water and allowed to stand for a 
short time. The debris settles to the bottom, leaving the 
most of the organisms in the clear water above. The bot¬ 
tom part of the funnel is closed by holding it on the end of 
one’s finger, and the water is drained off into the funnel. 
If any organisms remain, the cup is again filled with water 
which is also poured into the funnel after the debris has set¬ 
tled. A small portion of the debris should be added to the 
catch also since some organisms might seek refuge in it. 
The material that is caught in the funnel is then transferred 
either to a vial containing alcohol or formalin, or else to a 
small cloth bag. With a little practice one can readily 
transfer the tube from the finger to the mouth of the vial 
without losing any material. The wire gauze is then freed 
of organisms by rinsing it up and down in the alcohol or 
formalin in the vial. If one wishes to carry a large number 
of such catches in a small container, the material is trans¬ 
ferred with a little water from the funnel to a small cloth 
