Il6 THE A B C OF PHOTO MICROGRAPHY 



ing circular opening if possible, from 2% to 

 2% inches in diameter, is laid upon the slide 

 and covered with the previously cleaned thin 

 glass of same size. Should there be more 

 than one to finish, all are treated in the 

 same manner before proceeding farther. A 

 gummed binding-strip to be had of any 

 dealer is now to be taken by one end be- 

 tween the thumb and forefinger and drawn 

 through a tray of water, gummed side upper- 

 most. When lifted from the tray the excess 

 of water should be removed by drawing it 

 between the thumb and finger of the other 

 hand with a gentle pressure, after which the 

 back may be dried by drawing it over a soft 

 towel. It is then to be laid upon any dry, 

 hard surface ; the slide and cover-glass, held 

 between the thumb and finger, are pressed by 

 one edge along its center, to which it will 

 adhere, and may be raised from the table. 

 Now bend it carefully around the corner and 

 repeat until all four sides are attached to the 

 center of the strip, with the ends overlapping 

 a little at one end of the slide. Then care- 

 fully press the paper along each side firmly to 

 the glass, turning the corners neatly and rub- 

 bing all down smoothly with finger and 

 thumb. This may not be a success at the 



