[Illustration: THE TWO OCEANS. (1) Aërial Ocean. (2) Greatest height attained by Messrs. Glaisher and Coxwell, being 36,960 feet, or seven miles above the sea level. (3) Aërial Alps, or stratum of clouds 15,000 feet in depth. (4) Highest bird-region.] WEATHER WARNINGS FOR WATCHERS BY THE “CLERK” HIMSELF. WITH CONCISE TABLES FOR CALCULATING HEIGHTS “The actuating force of every wind that blows; of every mighty current that streams through ocean depths; the motive cause of every particle of vapour in the air, of every mist and cloud and raindrop, is SOLAR RADIATION.”—_George Warington._ LONDON HOULSTON AND SONS PATERNOSTER SQUARE, E.C. 1877 [_The right of translation is reserved. Entered at Stationers’ Hall._] LIST OF WORKS OF REFERENCE. BOUTAN ET D’ALMEIDA. Cours Eléméntaire de Physique. BUCHAN, A. Introductory Text-book of Meteorology. _W. Blackwood and Sons_, 1871. CAZIN, ACHILLE. La Chaleur. _Hachette and Co._, 1868. CRAMPTON, REV. JOS., M.A. The Three Heavens. _W. Hunt and Co._, 1876. CHAMBERS’ Encyclopædia. _W. and B. Chambers_, 1875. DREW, JOHN. Practical Meteorology. _Van Voorst_, 1870. FITZROY, THE LATE ADMIRAL. Weather Book and Barometer Manual. FLAMMARION, CAMILLE. L’Atmosphere. GUILLEMIN AMEDÉE. Les Forces de la Nature. GLAISHER, J., F.R.S. Hygrometrical Tables. _Taylor and Francis_, 1869. HARTLEY, W. N. Air and its Relations to Life. _Longmans_, 1875. HERSCHEL, SIR JOHN F. W. Meteorology, from Ency. Brit. _A. and C. Black_, 1860. KAEMTZ, L. F. Complete Course of Meteorology. _Baillière London._ MARTIN’S Natural Philosophy. _Simpkin, Marshall and Co._, 1868. TYNDALL, JOHN, D.C.L., &c. Heat, a Mode of Motion. Fifth Edition. _Longmans_, 1875. RODWELL. Dictionary of Science. _E. Moxon and Co._, 1871. PROCTOR. Science Byways. _Smith, Elder and Co._, 1875. SCOTT, R. H., M.A., F.R.S. Instructions in the Use of Meteorological Instruments, 1875. WARINGTON, GEORGE. Phenomena of Radiation. CONTENTS. PAGE Actinometer 10 Æthrioscope 16 Altitude tables 37 Anemograph 84 Anemometers, velocity 80 Aneroid barometer 35