1890.] 



NEW-YORK MICROSCOPICAL SOCIETY. 



particular. Two strips, of equal length and breadth, say one 

 inch long and one-quarter of an inch wide, cut from the 

 ordinary square thin cover-glass, are cemented to a slide with 

 Canada-balsam, as seen in Fig. i, L, L. The object is now 

 placed in a large drop of water between these two strips, under 

 a one inch square cover-glass, and the entire capillary space 



may be filled, if necessary, by adding a few more drops of 

 water. 



Two short strips of linen, S, S, are now inserted, one at each 

 end, and are held in position by two rubber bands, passing 

 over the cover-glass and around the slide. In order to secure 

 a flat surface on the under side, the slide is now cemented to 

 another slide by means of two pieces of wax, equal in diameter 

 to that of the rubber bands. 



A ^ass (Fig. 2 B, 1.), reaching about three inches above the 

 stage of the microscope, is filled with water, and a glass siphon 

 inserted, the shorter arm of which has a much smaller opening 

 than the longer. After filling the siphon with water, a strip of 

 linen is gradually forced into the longer arm, till the flow of 

 water is reduced to dropping. The linen strip is now cut the 

 required length, and connected with one of the short pieces at 



