(Weinheim: Offprint from: Zeitschrift für Elektrochemie. Nr. 6., 1907, February).

SCARCE OFFPRINT ISSUE OF AN IMPORTANT EINSTEIN PAPER OF STATISTICAL MECHANICS and a continuation of his remarkable 1905 and 1906 publications on Brownian Motion, which not only led to the proof of the existence of the atom but also worked to determine the size of atoms, and how many atoms there are in a mole, or the molecular weight in grams, of a gas. This paper also contains a note on the technical meaning of "average velocity." Item #25711

First Edition, Offprint Issue from Volume 13, number 6. Single sheet, approximately 10" x 8" pp 41-42 pp. A very fine example of this rare issue, a very minor and unobtrusive stain to an upper corner.