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Page 456 - Manual of Elementary Problems in the Linear Perspective of Form and Shadow I2mo, i oo Plane Problems in Elementary Geometry I2mo, i 25 Primary Geometry I2mo, 75 Elements of Descriptive Geometry, Shadows, and Perspective 8vo...
Page 289 - Bigelow, was published at the time in the fifth volume of the " New England Journal of Medicine and Surgery." In the year 1820 Dr. Boott crossed the Atlantic for the last time, and proceeding to London entered upon the study of medicine, under the direction of the late Dr. Armstrong. He continued his medical studies at the University of Edinburgh, where he took the degree of MD in 1824. The next year he...
Page 447 - Resolved by the National Academy of Sciences, That, in the opinion of this academy, the volumes entitled "Sailing Directions," heretofore issued to navigators from the Naval Observatory, and the "Wind and Current Charts," which they are designed to illustrate and explain, embrace much which is unsound in philosophy, and little that is practically useful ; and that therefore these publications ought no longer to be issued in their present form.
Page 138 - Preliminary Notice of the Fauna of the Potsdam Sandstone ; with remarks upon the Previously known species of Fossils, and Descriptions of some New Ones, from the Sandstone of the Upper Mississippi Valley. Ibid., pp. 119-209, 6 plates. 127. Supplementary Note on the Potsdam Sandstone.
Page 188 - When accident brings them into the immediate neighbourhood of the earth, they produce the phenomena of shooting-stars and fireballs. It has been shown by repeated observation, that on a bright night twenty minutes seldom elapse without a shooting-star being visible to an observer in any situation. At certain times these meteors are observed in astonishingly great numbers; during the meteoric shower at Boston, which lasted nine hours, when they were said to fall " crowded together like snow-flakes,"...
Page 196 - This view, it was thought, explained why the warming power of the sun was so much weaker at the top of a mountain than at the bottom, and why, in spite of his immense radiation, he retained his full powers. This belief, which especially prevails amongst imperfectly informed people, and which will scarcely succumb to correct views, is directly contradicted by the excellent experiments made by Pouillet at different altitudes with the pyrheliometer. These experiments show that, everything else being...
Page 409 - ... 00109. This ratio represents the proportionate elevation or depression of the barometer above or below its mean height that should be caused by the earth's rotation, and it corresponds very nearly with the actual disturbance at stations near the equator. From Oh. to 6li.
Page 190 - ... through which the weight falls increases. This velocity, however, if it be only produced by the fall, cannot exceed a certain magnitude ; it has a maximum, the value of which depends on the volume and mass of the attracting celestial body. Let r be the radius of a spherical and solid celestial body, and g the velocity at the end of the first second of a weight falling on the surface of this body ; then the greatest velocity which this weight can obtain by its fall towards the celestial body,...
Page 421 - This plant is evidently quite distinct from Calamites proper. The Calamite-like cast is a pith or internal cavity, surrounded by a thick cylinder of woody tissue consisting of scalariform vessels and woody fibres with one row of round pores; external to this is a bark of cellular and bast tissue. The structure appears to be allied to that of Sigillaria and is one of the most common in the beds of bituminous coal. M. C., Sydney (R. Brown) ; MC, Joggins, Pictou (JWD) ; Coal Creek (CB Matthew).