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ABSTRACT THE _Monthly Microscopical Journal_ commences with an article, illustrated with a plate, “On Organic Bodies in Fire Opal,” by Mr. H. J. Slack, in which the author, from the

appearances which he finds and describes, expresses an opinion, though not a decided one, that these minute bodies may be vegetable fossils, possibly algæ, though the evidence he adduces is

extremely slight. Dr. G. W. Royston Pigott continues his researches on the high-power definition of organic particles, and re-affirms that the generally received description of the Podura

scale is erroneous, on account of the employment of spherically over-corrected objectives.—Mr. Wenham criticises Dr. Pigott's paper in the preceding number of the Journal, remarking

truly that the patience of microscopists must eventually become exhausted by the repetition of the same theme, He then shows that Dr. Pigott claims, without foundation, discoveries with

regard to the improvement of object-glasses and the “colour test.”—Dr. Maddox, On the apparent relation of nerve to connective-tissue corpuscles, &c., in the Frog-Tadpole's Tail,

describes, in connection with the observations of Eberth, Kuhne, and Moseley, cases in which nerve-fibres seem to lose themselves in connective tissue corpuscles. His results are not very

decided, and hardly tend to settle the question.—Mr. Edwin Smith describes a new substage for the microsope, and certain appliances for illumination.—The paper read before the Royal Society,

by Messrs. Pode and Lankester, is given in full. Their experiments are divided into eight series, in which infusions of hay and turnip, mixed or unmixed, with cheese finely divided or in

lumps, are boiled and some of them scaled. When the cheese was finely comminuted, Bacteria did not appear; when in lumps, they were frequently found. In a boiled turnip infusion, placed in a

retort of which the end was left open, there was no cloud developed after many weeks, which is quite contrary to the observations of Dr. Bastian (NATURE, Feb. 6, p. 275.) Access through

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PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE _Scientific Serials_ . _Nature_ 8, 499–500 (1873). https://doi.org/10.1038/008499a0 Download citation * Issue Date:

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