Early Theories of Sexual Generation.—By F. J. Cole, D.Sc.Oxon., F.R.S.A Biographical Sketch of Francis James Blight, F.R.S.E., Publisher. — By GeorgeHawker, with a Foreword by J. W. Ewing, M.A., D.D.The Technical Instrument Bulletin.—Edited by A. G. Frewin.Microscope Record.—No. 22.The Science of Life.—By H. G. Wells, JulianHuxleyand G. P. Wells.Bacteriological Technique.—By J. W. H. Eyre, M.D., M.S., F.R.S. Edin.British Scientific Instruments in Industry.The ŒdogoniaceÆ.—A Monograph including all the Known Species of the Genera BulbochÆte, Œdocladium, and Œdogonium.—By L. H. Tiffany, M.Sc., Ph.D.Lecture Experiments in Optics.—By B. K. Johnson, F.R.M.S.Enzymes.—