ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
97 
test-tube R filled with sterilized hay infusion. Two very fine capillary 
glass tubes C C' C" bent to a U shape are then placed in the test-tube. 
The longer leg of one rests close to the cover-glass on the slide O. 
This allows a very small quantity of water to flow down by capillary 
Fig. 12. 
glass. 
The rest of the arrangement is merely to supply air to the test-tube, 
as the infusoria tend to run towards the edge of the cover-glass if air 
be deficient. The water in the funnel Tr presses the air from the flask 
through the tube L out of the capillary point M in the test-tube. 
Thermostat with Electro-magnetic Regulator.*— N. Sacharoff has 
devised an instrument which is at the same time a modification and com- 
bination of Sahli and Scheibler’s regulator (fig. 13). Upon the chimney 
of a mineral-oil lamp is placed a tin box, from opposite sides of which 
* Protokoll. d. Kaiserl. Kankas. ]\Ied. Gesell., 1888, p. Ill (Enssian). Cf. 
Zeitsclir. f. Wiss. Mikr., vi. (1889) pp. 49-50 (I fig.). 
1890. 
H 
