516 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
the horizontal tube will continue to travel towards the left, so that 
presently the water will run down the tube E, along the tube E', and, 
passing through the ice-box, will so lower the inside temperature that 
tbe capsule will collapse a little, and cause the flowing water to again 
take up a position midway between the two tubes. 
Incubator for any Source of Heat.* — This incubator, described by 
Dr. H. Reichenbach, is practically a copy of Hearson’s. The only 
difference is the insertion of a pan to contain water on the floor of the 
incubator. This is intended to moisten the incubation air. The bottom 
of the incubator is perforated by a series of holes which can be closed 
by means of a damper. Through these holes the air enters, and passes 
through the water in the pan before it reaches the incubation space. 
The level of the water is kept constant by means of a funnel at the side 
of the incubator. This addition seems rather a complication than an 
improvement. 
(4) Photomicrography. 
Apparatus for Obtaining Instantaneous Photomicrographs. — 
The following is an account of the apparatus exhibited by Mr. C. Lees 
Curties on May 16th last. This instrument can be attached to any 
Fig. 48. 
ordinary photomicrographic apparatus, whether horizontal or vertical, 
and consists essentially of an instantaneous pneumatic shutter, fitted 
with means of observing and focusing the object to be photographed 
until the moment of exposure. This is arranged by means of a prism A 
(fig. 48), mounted in front of the shutter aperture B, reflecting the image 
at right angles to a grey glass screen C, fitted in adjustable tube. 
In using this instrument the shutter is half set, so that the image 
can be accurately focused in the plane of the sensitized plate. When 
* Centralbl. f. Bakteriol. u. Parasitenk., xv. (1894) pp. 847-50 (2 figs.). 
