THE BREWER'S MICROSCOPICAL

LABORATORY.

EQUIPMENT.

APPARATUS.

Balance with a capacity of 1 kg., and sensitive to I cg. Should be incased in a wooden case with glass sides.

Microscope with a magnifying power of 60 to 500 diameters. Slides are glass slips generally about three inches long and one inch wide, on which the objects under examination are placed. Cover glasses are round or square very thin pieces of glass, and are used for covering the object after it has been placed on the slide.

Cover glasses and slides are cleaned before using by immersing

Hæmatimeter (Yeast Counting Apparatus).

them in a mixture of equal parts of ammonia water and alcohol, afterward drying them with a soft linen rag.

Haematimeter for counting yeast cells or bacteria in beer. It is composed of a slide, in the center of which a square cover glass, 0.2 millimeters thick, having a circular opening, is cemented. Inside of this opening, and concentric to it, is also cemented another round cover glass of one-half its thickness (0.1 millimeter). By covering the larger cover glass with a third, a space of 0.1 millimeter is formed between the thin, small glass and the cover glass, which space serves as a receptacle for holding the liquid to be examined. The deeper circular space formed be