On the cheapest form of light
Subtitle: from studies at the Allegheny observatory
Published: 1890
Place of publication: New Haven
Language: eng
Number of pages: 17
Notes: "From the American journal of science, vol. xl., Aug. 1890."

A photometric and thermal investigation of the phosphorescence of the pyrophorus noctilucus or fire-fly of Cuba.

By S.P. Langley and France W. Very.

Includes bibliographical references.