152 MICROSCOPIC OBJECTS, 



charred or dyed in a decoction of fustic or other dye- 

 wood, and when of a sufficient colour it is ready for 

 mounting. The vascular and cellular tissues of delicate 

 plants, the scales of fish, &c., are often improved by 

 colouring. Note. — Objects for the polarizing micro- 

 scope do not require colour, as the light is decomposed 

 and not simply refracted by them. 



In preparing and mounting microscopic objects the 

 following articles will be usefd : — 



Glass slides. — No. 1,3 inches by 1; No. 2, 2 inches by | of an inch. 



Thin glass, in slips and circles ; thickness about l-30th of an inch. 



Black, white, and coloured papers. 



Watch-glasses, 1^ to 2 inches diameter. 



Small white painters' saucers, 2 to 3 inches diameter. 



Turpentine, and spirits of wine. 



Canada balsam (old and clear). 



Gum -water. 



Hydrochloric and nitric acids. 



Japanners' gold size and Brunswick black. 



Glass tubes, various sizes from l-20th to ^ an inch diameter. 



Needles in handles. 



Fine wire gauze for sieves (various sizes). 



Camels' hair brushes. 



Cork for cutting out discs, &c. 



Pigs of dog-wood as used by watchmakers. 



Writing-diamonds and plough cutting-diamonds. 



Pointed scissors, two or three sizes. 



Clean chamois leather. 



Elder-pith, dry, to clean hard bodies. 



Scalpels or fine knives. 



Card-boxes 3 inches long by 2 inches wide, clean inside. 



Pliers, tweezers, nippers and small files. 



A spirit-lamp. 



Punches, various sizes. 



