120 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
glass can be killed in this state, and after removal of the water pre- 
serving liquid can be introduced. The colouring and hardening of 
creatures so fixed is very convenient. The author has also used the 
aquarium for the imbedding of small objects in paraffin. For Amoebse and 
similar organisms, for example, a triangular piece is cut out of the slide, 
and the cover-glasses are cemented on with isinglass. The creatures 
introduced sink to the bottom into the point of the triangle. The xylol 
in which they were preserved is removed and replaced by paraffin. The 
slide is then placed in cold water, when the paraffin solidifies and sepa- 
rates from the walls of the aquarium. The isinglass at the same time dis- 
solves in the water, and the paraffin-block thus set free is ready for cutting. 
The aquarium can also be used for orienting small objects for cut- 
ting. For this purpose some of the very finely fibrous material sold 
under the name of Penghawar-Djambie is introduced with the xylol 
into the aquarium. A small round hole is made in this with a 
rounded wooden rod, and the object to be oriented is placed in it. 
The object is held in any desired position by means of the fine fibres 
and can be readily adjusted under the Microscope. The xylol can then 
be replaced by paraffin, or the orientation can be originally made in 
paraffin on the hot stage. 
Fig. 21. 
Apparatus for Paraffin Imbedding.* — Dr. A. Kolossow describes 
an apparatus for imbedding objects in paraffin, which though much 
* Zeitschr. f. wiss. Mikr., xi. (1894) pp. 154-61 (5 figs.). 
