Abstract
Journal of the Royal Microscopical Society for April, 1881, vol. i. ser. ii. part 2, contains—Prof. P. Martin Duncan, on a Radiolarian and some Microspongidæ from considerable depths in the Atlantic Ocean (plate 3).—Dr. Lionel S. Beale, the President's address.—Prof. E. Abbe, on the conditions of orthoscopic and pseudoscopic effects on the binocular microscope.—A. D. Michael, on a species of Acarus believed to be unrecorded (plate 4).—Prof. E. Abbe, on the estimation of aperture in the microscope. The summary of current researches, pp. 217–364.—Proceedings of the Society. (In the summary of current researches appears a memoir by Mr. Crisp, “On Aperture, Microscopical Vision, and the Value of Wide-Angled Immersion Objectives,” in which the whole subject is very exhaustively and clearly put.)
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Scientific Serials . Nature 24, 70 (1881). https://doi.org/10.1038/024070a0
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DOI: https://doi.org/10.1038/024070a0