Book reviewed in this article:Zur kenntniss des generationswechsels und der Parthenogenesis bei den Insecten. Von Rud.On the Recent Foraminifera of Great Britain. By William Crauford Williamson, F.R.S.A Descriptive Catalogue of the most instructive and beautiful objects for the Microscope. By L. Lane Clarke.On the Mode of Formation of Shells of Animals, of Bone, and of several other Structures, by a process of Molecular Coalescence, demonstrable in certain artificially formed products. By George Rainey, M.R.C.S.The Microscope in its application to Clinical Medicine. By Lionel Beale, M.B.The Aquarian Naturalist; a Manual for the Sea‐side. By Thomas Rymer Jones.Manual of Technical Analysis, a guide for the testing and valuation of the various natural and artificial substances employed in the Arts and Domestic Economy, founded upon the ‘Handbuch’ of Dr. P. A. Bolley. By Benjamin Paul, Ph.D.