i809] MICROSCOPICAL JOURNAL. 221 



surface on the side having the glass-cover (see paragraph 

 12), 2 and 3-16 inches long by finch wide, leaving about | 

 inch on each side and 5-16 inch on each end. Then cut 

 off one end 1-16 of an inch on top and 1-16 inch on the 

 end of the cell. This will allow the glass-cover to be 

 pushed out through the slot thus made at one end of the 

 slide. If there is no glue on the glass it will come out 

 quite easily when you press it with your thumb and slide 

 it towards the slot ; or it can be pushed out from the op- 

 posite end with a blunt needle pierced through the paper. 

 Do not use a sharp needle, or you will crack the slide. 

 Before cutting the slot in the end of the slide, measure 

 both ends accurately and cut the widest end, as the glass 

 slips are frequently a little wider at one end than at the 

 other. Grind the corners of the end to be pushed in on 

 an oilstone : this will prevent the usually sharp corners 

 of the glass from tearing the paper when it is pushed 

 into place. 



12. When building up the slide keep sketch No. 2 in 

 front of you and work in the same way. By this means 

 you will always know which is the top or glass-cover side, 

 as the bottom is the side on which the last strip, 1 by 3, 

 is pasted (paragraph 10). 



13. Take the glass slip out, and replace it with a strip 

 of mica or thin tin. Blacken the edges where cut, and 

 put aside for an hour for the black to dry. Then replace 

 the glass slip, and put aside in a warm place (not hot) for 

 five or six days, to thoroughly dry and season. If allow- 

 ed to dry without the glass slip being in place, it will 

 be sure to warp. 



Card. — Qualitative, Quantitative and microscopical urin- 

 alyses, urinary calculi, gonococcus, urine for diagnosis of 

 typhoid, sputum for bacillus tuberculosis,analysis of water, 

 vinegar, milk, tests for arsenic in wallpaper, etc. — W. If. 

 Ohltr, Portland, Me. 



