Sponge Gold Microscope Slide by John H. Caswell

Description

Sponge Gold Microscope Slide by John H. Caswell
Whole mount of sponge gold in deep-well metal microscope slide by John H. Caswell for viewing under reflected light. John Henry Caswell (1846-1909) was a teacher of mineralogy at the School of Mines of Columbia College, New York, and a businessman. A biographical memoir by James F. Kemp may be found in the
Annals of the New York Academy of Sciences, volume 19, pages 353-356, 1909
. Slide dates to late 1800s.