Vital Statistics, 1892. Observations and Reports (continued). The Institute. Chicago :-Royal Commission for the Chicago Exhibition, 1893. Official Catalogue of the British Section. 8vo. London 1893. Marine Biological Association of the United Kingdom. Coimbra :-Observatorio Meteorologico e Magnetico. Observações Meteorologicas e Magneticas. 1892. Folio. Coimbra 1893. The University, Coimbra. Dorpat:-Meteorologisches Observatorium. Meteorologische Beobachtungen. Bd. VI. Heft 2. 8vo. Jurjew 1893. Dublin :-General Register Office. The Observatory. Weekly Return of Births and 8vo. Dublin. The Office. France-Service des Topographies Souterraines. Études des Bassin Houillier et Permien 4to. Paris 1893. Gîtes Minéraux de la France. The Service. London:-Medical Department of the Navy. Statistical Report of the Health of the Navy for the Year 1892. 8vo. London 1893. The Department. Meteorological Office. Daily Weather Report. July-December, 1893. 4to. London; Weekly Weather Report. Vol. X. Nos. 44-52. 4to. London; Report of the Meteorological Council to the Royal Society for the year ending 31st March, 1893. 8vo. London 1893. The Office. Melbourne-Office of the Government Statist. General Report of the Census of Victoria, 1891. By H. H. Hayter. 4to. Melbourne 1893. The Government Statist. New South Wales:-Geological Survey. Records. Vol. III. Part 4. 8vo. Sydney 1893. Department of Mines, Sydney. Observations and Reports (continued). Folio. Année Paris:-Service Hydrométrique du Bassin de la Seine. Observations sur les Cours d'Eau et de la Pluie. Année 1892. Versailles; Résumé des Observations Centralisées. 1892. 8vo. Versailles 1893. Rio de Janeiro :- -Observatorio. Janeiro 1893. Annuario. San Francisco:-California State Mining The Service. 1893. 8ro. Rio de The Observatory. Bureau. Eleventh The Bureau. The Commission. Spain :-Comisión del Mapa Geológico de España. Mapa Geológico de España. 10 Sheets. Sydney: Observatory. Meteorological Observations. June, 1893. 8vo. [Sydney.] The Observatory. Upsala-Observatoire. Observations du Magnétisme Terrestre faites à Upsala pendant l'Exploration Internationale des Régions Polaires en 1882-83. 4to. Stockholm 1893. Royal Swedish Academy of Sciences, Stockholm. Washington :-U.S. Department of Agriculture. Experiment Station Record. Vol. V. No. 1. 8vo. Washington 1893; Weather Bureau. Monthly Weather Review. September, 1893. 8vo. Washington; Report of the Ohio Weather and Crop Service. October-November, 1893. 8vo. Norwalk. The Department. U.S. Patent Office. Official Gazette. Vol. LXV. Nos. 4-13. 8vo. Washington 1893. With Alphabetical Lists of Patentees and Inventions. The Office. Journals. more. American Chemical Journal. Vol. XV. Nos. 6-8. 8vo. Balti- American Journal of Science. July-December, 1893. 8vo. New The Editors. Analyst (The) July-December, 1893. 8vo. London. Society of Public Analysts. Annalen der Physik und Chemie. 1893. Nos. 7-12. 8vo. Leipzig; Beiblätter. 1893. Nos. 6-11. 8vo. Leipzig. Annales des Mines. 1893. Livr. 6-11. The Editors. 8vo. Paris 1893. Annales des Ponts et Chaussées. 1893. Asclepiad (The) Vol. X. No. 39. 8vo. London 1893. VOL. LV. Sir B. W. Richardson, F.R.S. Journals (continued). Astronomie (L') Août-Décembre, 1893. 8vo. Paris. The Editor. Astronomy and Astro-Physics. December, 1893. 8vo. Northfield, Minn. The Editors. Athenæum (The) July-December. 1893. 4to. London. The Editor. Boletin de Minas Industria y Construcciones. Año IX. No. 10. Escuela de Ingenieros, Lima. 4to. lima 1893. Builder (The) July-December. 1893. Folio. London. The Editor. Chemical News. July-December, 1893. 8vo. London. Mr. W. Crookes, F.R.S. Cosmos. Juillet-Décembre, 1893. 8vo. Paris. M. l'Abbé Valette. Educational Times (The) July-December, 1893. 4to. London. College of Preceptors. Electrical Engineer (The) July-December, 1893. Folio. London. The Editor. Electrical Review (The) July-December, 1893. Folio. London. The Editor. Electrician (The) July-December, 1893. Folio. London. The Editor. Electricien (L') Juillet-Decémbre, 1893. Folio. Paris. The Editor Fisherman's (The) Nautical Almanac and Tide Tables. 1894. 8vo. Grimsby 1893. Horological Journal. Vol. XXXVI. No. 425. The Editor. 8vo, London 1893. British Horological Institute. Industries and Iron. July-December, 1893. 4to. London. Meteorologische Zeitschrift. 1893. Heft 7-11. Wien. Morphologisches Jahrbuch. 1893. The Editor. Oesterreichische Gesellschaft für Meteorologie. Morskoi Sbornik. 1893. Nos. 7-9. Nature. July-December, 1893. Roy. 8vo. London. Nature Notes. Vol. V, No. 49. 8vo. London 1894. ་ The Editor. Selborne Society. New York Medical Journal. July-December, 1893. 4to. New York. The Editor. The Editor. Notes and Queries. July-December, 1893. 4to. London. Journals (continued). Observatory (The) July-December, 1893. 8vo. London. Revue Générale des Sciences. Juillet-Décembre, 1893. Paris. 8vo. The Editor. Revue Scientifique. Juillet-Décembre, 1893. 4to. Paris. The Editor. Symons's Monthly Meteorological Magazine. July-December, Institute of Technology. Zeitschrift für Biologie. Bd. XI. Heft 3-4. Bd. XII. Heft 1-2. 8vo. München 1893. The Editors. Brodie (Rev. P. B.) Notes on the Eocene Tertiary Insects of the Isle of Wight. 8vo. 1893. The Author. Browning (J.) Our Eyes, and how to preserve them from Infancy to Old Age. 8vo. London 1892. The Author. Dawson (Sir J. W.), F.R.S. The Canadian Ice Age: being Notes on the Pleistocene Geology of Canada, with especial reference to the Life of the Period and its Climatal Conditions. 8vo. Montreal 1893. The Author. Gamgee (A.), F.R.S. A Text-book of the Physiological Chemistry of the Animal Body. Vol. II. 8vo. London 1893. The Author. Gore (G.), F.R.S. The Decomposition of Liquids by Contact with Powdered Silica, &c. 8vo. Birmingham 1893. The Author. Grant (J. A.) Abstract of the Code of Customary Law for the Amritsar District. Vol. XI. 8vo. Lahore 1893. The India Office. Index Kewensis; an Flowering Plants Parts 1-2. 4to. Sir Joseph Hooker, F.R.S. Hooker (Sir J. D.), F.R.S., and B. D. Jackson. The Authors. Sidgreaves (W.) The Physical Constitution of the Sun. 8vo. [1893.] The Author. Manchester Wardle (T.) On the Relation of Design to such Craft Teaching as may be undertaken by Technical Schools. 4to. 1893. The Author. Photogravure Portrait of Professor Michael Foster, Sec. R.S., after a painting by H. Herkomer, R.A. The Subscribers to the Foster Portrait Fund, Trinity College, Cambridge. January 25, 1894. Sir JOHN EVANS, K.C.B., D.C.L., LL.D., Vice-President and Treasurer, in the Chair. A List of the Presents received was laid on the table, and thanks ordered for them. By I. "On Intra-cranial Pressure. Preliminary Note." LEONARD HILL, M.B., Assistant Professor of Physiology, University College, London. Communicated by Professor BURDON SANDERSON, F.R.S. Received November 16, 1893. (From the Physiological Laboratories of Oxford and University College.) My purpose in the following note is to submit to the Royal Society the results of experiments, made during the past year, relating to the "intra-cranial pressure" (i.e., the pressure to which the brain is normally exposed in the cranial cavity), and the changes which can be produced in it by alterations of the form and diminution of the capacity of the cranial cavity. The experiments were undertaken at the suggestion of Professor Burdon Sanderson, and have been carried out with his help and criticism. The animals employed were cats or dogs. Ether, chloroform, and morphia were used as anæsthetics. Methods of Research. Methods of Producing Alterations of Pressure within the Subdural Space. a. The skull is trephined in the parietal region, the dura mater freely divided, the trephine hole "wormed" with an ordinary |