96 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
strip S, while the other clips down into a tumbler placed below and 
underneath the Microscope stage. With this apparatus nearly 50 ccra. 
Fig. 10. 
of water flows across the stage in the twenty-four hours, this being at the 
rate of about 3 cm. a minute. 
Schulze’s Compressorium.'^ — The object of this apparatus (fig. 11) 
is to apply pressure to an ordinary slide when upon the stage. 
A B is a clamp to be 
attached to the side of the 
stage, carrying the piece 
C D, which rotates on the 
}3in at K. The bent lever 
G is suj}2)orted at C, and 
can be raised and lowered 
against the spring E by 
the screw F. At the other 
end of G is the fork H, in 
which screws a ring J, with an opening of 12 mm. 
The apparatus is screwed on the stage so that the opening of the 
ring lies on the cover-glass of the preparation, when by turning the 
screw F pressure can be applied as desired. 
Apparatus for examining the developmental stages of Infusoria 
under the Microscope.j — Dr. L. Rhumbler devised the following appa- 
ratus for examining Colpoda cucuUus and C. Steinii in hay infusion. To 
the vertical bar of the Microscope S/ (fig. 12), is fastened a medium sized 
Fig. 11. 
* Behrens, Kossel, and Schiefferdecker, ‘ Das Mikroskop und die Methoden der 
mikroskopischen Untersuchung,’ Band i., 8vo, Braunsediweig, 1889, p. 53 (1 fig.). 
t Zeitschr. f. Wiss. Zook, xlvi. (1888) p. 549. Cf. Zeitsclir. f. Wiss. Mikr., vi. 
(1889) pp 50-1. 
