Il6 ELEMENTARY PHOTO -MICROGRAPHY. 



corner and suspended from a line until dry. Print- 

 ing frames should have open ends to enable the 

 paper to be raised for examination with ease when 

 the half-back is folded over on its hinge. Some 

 cheap frames have a deep recess, into which the 

 negative and paper drop as into a box, making it 

 extremely difficult to inspect the process of print- 

 ing without creasing the paper in the endeavour to 

 raise it. A mask with an opening of a suitable 

 size and shape placed between the negative and the 

 paper will give a neat finish to the print. 



The print from a negative that happens to be 

 too dense at one end or too thin at the other may 

 be improved when using gaslight paper by simply 

 holding the negative at an angle during exposure 

 to the light, the thin part, of course, being held to 

 slope away from the flame. 



Bromide paper is the quickest for microscopic 

 work, and can be done by gaslight. It gives a 

 contrast of velvety black and white, but the picture 

 is not visible after exposure until developed. More 

 uniform results may be obtained from artificial 

 light than from daylight, if several prints are to be 

 taken from one negative, because the correct 

 exposure, having once been ascertained, can be 

 repeated. 



The Velox carbon matt is especially suitable 

 for the purpose, being a slow paper capable of 



