172 The Microscope. 



A most cordial vote of thanks was unanimously tendered Dr. 

 Mouser for his very interesting and instructive exhibition. 



A. H. Bkechenfeld, Secretary. 



ST. LOUIS CLUB OF MICROSCOPISTS. 



I HE following gentlemen met at the St. Louis College o' 

 -*- Pharmacy, Tuesday evening, May 3rd, and organized the St. 

 Louis Club of Microscopists : H. M. Whelpley, president ; J. C. 

 Falk, vice-i>resident ; V. J. Mueller, secretary ; Frank Davis, treas- 

 urer ; E. T. Jester, Otto Meyer, H. L. Wichmann, Wm. Uhardt, and 

 A. C. Speth. The club will meet on the first Tuesday of each 

 month, and pay special attention to microscopical technology and 

 the examination of drugs. — National Druggist 



ELEMENTARY DEPARTMENT, 



FOURTH LESSON. 



" CLEANLINESS IS AKIN TO GODLINESS." 



\ PPARATUS and materials required. — L One ounce of chloro- 

 -*■ ^ form-balsam. 2. One ounce of oil of cloves. 3. One pint 

 of spirits of tu.rpentine. 4. One ounce of a one- half per cent, 

 solution of silver nitrate. 5. One-half dozen porcelain butter-dishes 

 and a like number of glass salt-cellars. 



1. Chloroform-balsam can be prepared by taking a quantity of 

 Canada balsam — a yellowish, clear, viscid turpentine — and to it 

 adding sufficient chloroform to make it thin enough to drop slowly, 

 and without stringing, from the point of a glass rod. Chloroform 

 can be added from time to time to supply that lost by evaporation. 

 A good receptacle for this liquid is a wide-mouthed bottle, fitted with 

 a hollow-glass stopi)er. Now take a glass rod and, by heating it, 

 draw it out to a tapering point, and break oflP that it be just long 

 enough to reach from the bottom of the bottle to the interior of the 

 stopper when fitted in. The rod can be thus left in the bottle and 

 kept free from dust. If one prefer, a capped bottle, with glass 

 pii:)ette, can be purchased in the shops for fifty cents. 2. The oil of 

 cloves should be pure and of light color. That sold by the various 

 dealers in microscopical goods will be found the most satisfactory. 

 3. As light decomposes this solution, it should be kept in a dark 

 place or in a bottle wrapped in blue paper. 4. The butter-dishes 

 and salt-cellars should be of good quality and free from lumps and 

 discol orations. The salt-cellars should have a deep bowl with 



