From the November 14, 1936, issue

DUST SHOWS UP LIKE STARS UNDER MODERN INSTRUMENT

Newest tool of science to detect conditions causing such diseases as silicosis is a special dust-counting microscope. With this it is hoped to attain more knowledge in the field of industrial health.

The illustration on the front cover of this week’s Science News Letter is not a view of the heavens as seen through a telescope, but the dust in the air man breathes as viewed on the darkfield background of the new instrument, which was developed by the Bausch and Lomb Optical Company.