PRINTING METHODS LANTERN SLIDES 



veloped with the same developer Metol- 

 Quinol. In rather an extended use of it 

 during the past month or two, I have not 

 seen a single instance of the markings so 

 common with Velox, and as it is coated on 

 a much heavier stock, the prints are even 

 better without mounting than are those of 

 the latter make. I am not sure if it can be 

 obtained in this country, but think it likely 

 that Wm. C. Cullen, 61 William street, New 

 York, who makes a specialty of foreign pho- 

 tographic articles, may be able to supply it. 

 I am sure it is worth trying, at least. 



Photo-micrographs, as a rule, look better 

 and are more pleasing when printed under a 

 mask with circular opening of suitable size 

 for the object, leaving a white margin about 

 the picture, which then is of the same shape as 

 the field seen in the microscope itself. These 

 masks may be made with the dark orange- 

 yellow " post-office" paper to be had every- 

 where, and which is perfectly safe for the 

 slow emulsions used in sensitizing all print- 

 ing papers. The openings are readily cut by 

 means of a "form" and a revolving wheel 

 cutter. There has recently been introduced, 

 at a trifling cost, a set of forms of various 

 shapes and sizes, together with a cutter, which 



