Research Laboratory of the Royal College of Physicians. 539 



one is enabled to get a large surface of gelatine, and a more 

 perfect diffusion of the organisms on the surface. 



The points of growth are easily counted through the Hat 

 glass bottom and transparent layer of gelatine. Another 

 great advantage is that if the orifice at the top be made large 

 enough (IJ inches in diameter) the points of growth may 

 be as readily removed, as from a plate cultivation, the 

 manipulator being able to reach any point of the surface of 

 the gelatine with his platinum needle. 



One of Browning's microspectroscopes has also been fitted 

 up in this room. liacks, for series of Hesse's tubes, and 

 shelving complete the fittings. Opening out from the bacterio- 

 logical room is a small room with a sink and large sloping 

 drainer, at which most of the glass apparatus is washed. 



The other two rooms on this flat are fitted up for 

 histological work with window tables, sinks, cupboards, 

 spirit vessels, and shelving, each for two workers. 



In connection with the histological department, apparatus 

 for microphotography has been fitted up by Mr Forgan. 



A smaller form (Fig. 19) consists of a base board on 

 which the microscope (6) (with the eyepiece in) is fixed with 

 a lamp («) in front. The microscope stands between two firm 

 uprights 26 inches high, at the top of, and between which, is 

 a cross bar holding a frame for focussing glass and dark slide. 

 The space between the dark slide and the microscope tube is 

 filled in with a black velvet funnel-shaped tube (c), which is 

 easily fixed around, or removed from, the tube. In using this 

 apparatus the specimen to be photographed is first fixed and 

 focussed on the microscope ordinarily used, which is then 

 placed on the base board and carefully lighted from the lamp 

 in front. The velvet funnel is drawn over the eyepiece and 

 tube, the image is focussed on clear waxed glass {d), after 

 which the dark slide is introduced. Before drawing the shutter 

 a piece of cardboard is placed between the mirror and the 

 section. To expose, simply remove this cardboard for the 

 necessary length of time. This apparatus can be used with 

 advantage for low powers only. It may be used with day- 

 light or. with gaslight. 



The larger form, for work with higher powers, is based on 



