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Page 215 - To explain the construction of the common barometer, and to shew that the mercury is sustained in it by the pressure of the air on the surface of the mercury in the basin.
Page 302 - Occasionally the traveler, when sitting upon his camel, is seized with the rdyle, a kind of brain-fever, which causes him to see the most fantastical objects in his delirious dreams. Even those who retain the entire possession of their faculties and clearness of their vision, are beset by distant mirages ; palm-trees, groups of tents, shady mountains, and sparkling cascades, seem to dance before their eyes. in misty vapor. When the wind blows hard, the traveler's body, is beaten by grains of sand,...
Page 302 - ... misty vapor. When the wind blows hard, the traveler's body is beaten by grains of sand, which penetrate even through his clothes, and prick like needles. 5. Stagnant pools or wells, dug with great labor in some hollow, from the sides of which oozes out a scanty and brackish moisture, point out, each day, the end of the stage. But often this unwholesome swamp, at which they hoped to be able to recruit their energies, is not to be found, and the people of the caravan must content themselves with...
Page 14 - ... if the earth's axis were perpendicular to the plane of its orbit, and the excessive variation which would result if the axis were nearly parallel to that plane.
Page 301 - Vegetation is rare, deprived as it is of the moisture which it requires ; the only plants to be seen are the Artemisia, thistles, and thorny Mimosas ; in some sandy districts there is a complete absence of all kinds of vegetation. The only animals to be found in the desert are scorpions, lizards, vipers, and ants. During the first few days of a journey across these sandy plains, some few individuals of the fly-tribe accompany the caravan, but they are soon killed by the heat of these dreadful regions.
Page 301 - Those districts of the Sahara which are destitute of oases present a truly formidable aspect, and are fearful places to travel over. The path which the feet of the camels have marked out in the immense solitude points in a straight line toward the spot which the caravan wishes to reach. Sometimes these faint foot-marks are again covered with sand, and the travelers are obliged to consult the compass, or examine the horizon ; a distant sand-hill, a bush, a heap of camels...
Page v - An important addition to the text books on physiographical geography is that by Jacques W. Redway, published by Charles Scribner's Sons, New York. This volume, as the author states in his preface, "is designed to show that the distribution of life is governed very largely by the conditions of geographic environment, and that human history and industries are always closely connected with geographic laws — in many instances the direct resultants of them.
Page 215 - The cistern form is the one most generally used for scientific observations, and is the best for measuring heights. One of the most approved forms of cistern barometers— known as " Fortin's barometer " — consists of a glass tube closed at one end and filled with mercury, the lower portion of which dips into another tube of larger diameter which contains a reservoir of mercury forming the
Page 250 - Accordingly, the most terrific that rage on the ocean have been known to spend their fury within or near its borders. Of all storms, the hurricanes of the West Indies and the typhoons of the China seas cause the most ships to founder. The stoutest men-of-war go down before them, and seldom, indeed, is any one of the crew left to tell the tale.
Page 145 - ... water of this well in the month of September is said to be quite warm ; so much so as to be unpalatable. " The other well (from which the ice was drawn) is in the centre of the village, not more than seventy yards from the Susquehanna, and is about a quarter of a mile from any hill. The distance from the surface of the ground to the surface of the water in the well is, at this date (Aug. 19th), 22| feet.