June 18, 1896—continued.
VI. “ Experimental Proof of van t Hoff s Constant, Dalton s Law. &c., in very dilute Solutions.” By Dr. M eyer W ildermasn, Communicated by Professor I itzgerald, F.R.S.
VII. “ On the Determination of the W ave-length of Electric Radiation by Diffraction Gratings.” By J. C. B ose. Communicated by L ord R ayleigh, Sec. R.S.
VIII. fiThe Effects of a strong Magnetic Field upon Electric Discharges in Vacuo.” By A. A. C. Swinton. Communicated by Lord K elvin, F.R.S.
IX. “ On the Structure of Metals, its Origin and Changes.” By M. F. Osmond and Professor R oberts-Austen, C.B., F.R .S.
X. “ Magnetisation of Liquids.” By J ohn S. T ownsend. Communicated by Professor J. J. T homson, F.R.S.
XI. Selective Absorption of Rontgen Rays.” By J. A. McClelland. Communicated by Professor J. J. T homson, F.R.S.
XII. “ On the Determination of Freezing Points.” By J. A. Harker, D .Sc. Communicated by Professor Schuster, F.R.S.
XIII. “ The M enstruation and Ovulation of Macacus rhesus; with Observations on the Changes undergone by the discharged Follicle. P art I I.” By W alter H eape. Communicated by Dr. M. F oster, Sec. R.S.
XIV. “ Phenomena resulting from Interruption of Afferent and Efferent Tracts of the Cerebellum.” By Dr. J. S. R isien Russell. Communicated by Professor V. H orsley, F.R.S. The Society adjourned over the Long Vacation to Thursday, November 19.
William J ackson P ope. Communicated by Professor Armstrong, F.R.S. Received February 7,—Read March
19, 1896.Crystals belonging to the monoclinic or anorthic systems are rarely « obtained in which the optical orientation is such that a large crystal face is so nearly perpendicular to a bisectrix that the apparent optic axial angle as observed in air can be directly measured by means of the ordinary Fuess apparatus. It thus becomes
