ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
95 
scope (figs. 8-10). The current of water for keeping the organisms 
alive is maintained by siphon action. Two oblong strips L of cover- 
glass (0*14 mm.), 28 mm. long and 6 mm. broad, are fixed parallel to 
Fig. 8. 
each other on a 3 by 1 in. slide, and at a distance of 8 mm., by means 
of Canada balsam. Within the ehannel thus formed is placed the object 
to be examined in a largish drop 
of water, and then a fairlydarge Fig. 9. 
cover-glass superimposed. Should 
the object not be exactly in the 
centre, it can easily be pushed 
into the desired position by 
inserting a bristle or glass thread 
under the cover-glass. At each 
end of the channel a short piece 
of linen S is pushed under the 
cover, which is fastened to the 
slide by a couple of rubber 
rings G. A second slide is laid 
underneath the first, and the two 
connected by means of wax. 
The pair of slides are then fixed 
to the stage in the usual manner 
by the clamps K. A large glass 
vessel B^, the lip of which pro- 
jects over the Microscope for 
about 5 cm., is filled with water, 
and in this hangs a doubly bent 
siphon H. Within the siphon is 
placed a strip of linen S^, the 
free end of which lies on the 
short strip S. By this arrange- 
ment a constant and regular in- 
flow of water is assured. The volume of water passing through the 
siphon is easily regulated by jamming the linen strip Si into the 
siphon tube more or less tightly. The outflow is managed by means 
of another strip of linen one end of which rests upon the short 
