[ no place ]: [ no publisher, but the American Society of Microscopists ] 1883. First Separate Edition. 6 pages plus printed green wrappers. 8vo (5 3/4 x 9 1/4 inches) An author's offprint of this paper published in the Proceedings of the American Society of Microscopists. INSCRIBED by author Gage "W. H. Mills, Nov 2, '86 from the author". Folded vertically as if for mailing. Paper browned, with tearing at the fore-edge. WITH single leaf laid in "Laboratory Notes and Queries" printed on one side, and signed in print S. H. Gage, and with penciled notes at the bottom referencing a Zeiss catalog with slide dimensions. We've chosen to keep these two together given that Gage apparently mailed them together at the same time (vertical crease is the same). Good. Pamphlet. 
Although the Proceedings of the American Society of Microscopists was widely circulated in institutions, both author offprints and the single sheet are rare. OCLC notes only four copies of this offprint, all with 6 pages (ACC#: 71115896). The single sheet appears just at Harvard (ACC#: 80593603) in the Ernst Mayr Libr-MCZ.
Gage was a well known microscopist who authored a number of well known books during his lifetime. Items INSCRIBED by him are in our experience uncommon.