802 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Fig. 91. 
Fig. 92. 
V 
same kind of silk as the net. To use the 
apparatus, first tie the little silk bottle on the 
ferrule, then drag the net after a boat, or 
through the water from the shore, by tying it 
to the end of a fishing rod or walking-stick. 
As soon as the “ catch ” is in the little silk 
bottle it is untied from the ferrule, using the 
same string to tie up its mouth, and put into 
the alcohol bottle. Each silk bottle is numbered 
so that a record of time and locality can be 
kept. This is much superior to the use of a 
glass bottle, for in pouring out enough of the 
contents of the glass bottle in order to insert 
the cork, one often loses very interesting forms, 
especially the Cladocera , on account of the 
bubble of air which usually is in the shells and 
which causes them to float to the top. 
A useful net is simply made from fine silk 
mull, 15 in. in diameter and 30 in. long.” 
Suction Capsule.* — The suction capsule, 
the invention of Mr. N. A. Cobb, is made from 
glass tubing, 2-5 mm. thick. The tubing is 
heated in a blow-pipe flame in two places and 
drawn out (fig. 91). One end is then broken off 
and heated until the aperture becomes minute. 
The other end is drawn out to the form shown 
at t (fig. 92). If after stopping u, fig. 92, with 
glue suction be made at r, 
while the tube at t is melted 
with a blow-pipe flame, the 
suction capsule results (fig. 
93). The use of this little 
instrument is to hatch eggs 
of parasitic entozoa in the 
alimentary canal. The eggs 
are placed within the cap- 
sule, and when swallowed, 
the gastric juice dissolves 
the glue and hatches the 
eggs. The capsule is easily 
recovered at the other end 
of the alimentary canal. 
Bohm, A.,und A. Oppel. — 
Taschenbuch der mikroskop- 
ischen Tecbnik. (Manual of 
microscopical technique.) 
Miinckeu und Leipzig, 1890. 
Froc. Soc. Linn. N.S.W., v. (1890) pp. 163-7 (3 figs.). 
