1370 



Journal of Applied Microscopy 



lamp, but finding that as a rule I had to be my own automaton, decided that a 

 hand feed lamp would do better, since less liable to get out of order, and so far 

 have no reason to regret the change. 



The condenser and accessories are the regular Bausch & Lomb, so need no 

 special description. In the figure the order from the lamp is : (1) condenser, 

 (2) iris diaphragm, (3) paralleliser, (4) ray filter, (5) water tank, (0) iris dia- 

 phragm shutter. In practice so far, however, I have dispensed with the iris 

 diaphragm, paralleliser, and ray filter, putting the water tank next to the con- 

 denser, and between tank and shutter using a flat tray on which ground or colored 

 glasses, or a glass trough containing Zeltnow's solution, can be placed, so that 

 the ray filter can be changed at a moment's notice. The lamp and condenser 

 are then arranged so that the latter focuses directly on the substage condenser 



Fig. 4. — Same as Fig. 3. X70, Lens, B. & L. i in. apochromatic : 



ocular, B. & L. i in. compensation ; exposure, i sec ; 



distance of plate from hood, 12 inches. 



or on the slide if no substage condenser is used. By this means a tremendous 

 flood of light is thrown on the object, and exposures can be cut down to a fraction 

 of a second without, so far as I can judge, affecting the results for the worse. 

 On the day of writing this, with an exposure of one-half second, I photographed 

 a small round cell sarcoma 25<) diameters on a Cramer slow isochromatic. 



The microscope stand rests on a fixed wooden block to which its horseshoe 

 foot can be clamped. 



The camera stand, as seen by the cut, consists of two cast iron uprights, 

 connected above by a solid cast iron beam on the top of which are the already 

 mentioned one-quarter inch spaces marked in white paint. This beam supports 

 the steel rods upon which the camera runs. 



