LAJB ORATORY EQUIPMENT 7 



the purity and comparative quality of the simple spices, as pepper, 

 allspice, cloves, cinnamon and ginger. However matters are 



FIG. i. Form of compound microscope suitable for bacteriological and general 

 microscopical work in food and drugs laboratories. Note the desirable and necessary 

 accessories as given in the text. The form of polarizing apparatus convenient to be 

 used with the compound microscope, sets into the substage diaphragm ring with the 

 iris diaphragm opened to the maximum. The analyzer takes the place of the ocular. 

 (Bausch 6r Lomb Co.) 



quite different when it comes to the examination of powdered 

 vegetable drugs, compound vegetable powders and vegetable 

 products of unknown composition. A thorough knowledge of, 



