1G56 



Journal of Applied Microscopy 



It is also necessary to close the iris diaphragm of the condenser until the 



image on the ground glass 



is not very bright, and then 

 to focus carefully with a 

 glass. The image will look 

 much finer on the ground glass 

 with the diaphragm more open, 

 but no fine details can be ob- 

 tained in this way. 



In photographing Aecidia 

 with the 3-in. objective the 

 light of the lamp is condensed 

 with bulls-eye onto the object, 

 covering up the condenser 

 beneath to prevent reflections. 



Fu;. ;^>. — I'uccinia vexans x'2'A). 



The Aecidium fraxini was made on a 

 Carbutt, No. 23, backed orthochromatic 

 plate with fifteen minutes exposure. 



The Fuccinias were made on Cramer's 

 medium orthochromatic plates with an 

 exposure of about one minute. 



All developed with ortol, which 1 have 

 just begun using and like better than any 

 I have tried. 



Decorali, Iowa. 



Fu;. 4.- Pucciiiia tloclimia .\2.")(>. 

 K. W. T). Hoi. WAV 



AN X-RAY TABLE. 



This table is a device for taking X-ray pictures stereoscopically ; its con- 

 struction permits the operator to shift the position of the X-ray tube a measured 

 distance horizontally or vertically, and also permits the removal of one photo- 

 graphic plate and the substitution of another beneath the part to be pictured 

 without disturbing the patient ; the second plate occupies precisely the same 

 position as the first. 



The table is made of hard wood, and is very solidly constructed for the sake 

 of stability. It is six feet long, nineteen and one-half inches wide, and thirty-four 

 and one-half inches high. It is supported on eight strong wooden legs. The 

 top of the table contains three rectangular openings, one in the center of the 

 table and one at either end. These openings are seventeen and three-quarters 

 inches long and fourteen and three-quarters inches w'ide. This corresponds to 

 the size of 14x17 X-ray plates enclosed in their envelopes. Over the entire 

 top of the table is stretched a sheet of pegamoid, with a canvas backing. 



