6. To erect a Perpendicular upon a given Line. 7. To divide a Circle and it's Periphery into four 8. To divide the Periphery of a Circle into 360 De- 9. To find the Contents of a Rectangled-Triangle. 10. Having the Semi-diameter given, to find the Pe- 11. Having the Periphery given to find the Diameter. 12. The Diameter of a Sphere being given, to find it's curve Surface, and Solidity, or folid Content. E 10. The Circumference of the Earth; it's Diameter, Surface, and Solid Content, in linear, Square, and cubic Miles. 11. The Errors and Defects of the feveral preceding Methods of measuring the Earth. 12. The Measure of the Parallels of the Earth. CHAP. V. Of the Motion of the Earth. Page 64. 1. The Motion of the Earth the Caufe of the Celestia Appearances, upon the Copernican Hypothefis. 2. A double Motion, befides the third, which is rather an Inclination of the Earth's Axis. 3. The Arguments for proving thefe Motions. 4. Objections answered. 5. The Velocity of this Motion in different Parts of the Earth. CHAP. VI. Of the Earth's Place in the Syftem of the World. Page 78 1. Common Opinion places the Earth in the Centre of the World. 2. The Situation of the Earth, and the Order of the Planets. 3. The Situation of the Earth upon the Copernican Hypothefis. 4. The Distance the Earth from the Planets. 2 CHAP. CHAP. VII. Of the Substance, internal Structure, and Compofition of the Earth. Page 87 1. To explain of what Subftances the Earth is composed. 2. The Earth divided into a confiftent and fluid Part, and the Atmosphere; or into Earth, Water, and Air. 3. How the Earth and Water bold together, and conftitute one Globe. 4. The Surface of the Earth continued, but not the Surface of the Waters. 5. How the Parts of the Earth are, from the Surface to the Center, is uncertain. 6. That Earth has it's Confiftency and Coherence from Salt. 7. Different kinds of Earth variously mixed in the Globe. 8. The Situation and Difpofition of the Parts of the Earth different at different Times. CHA P. VIII. Of the Divifion of the Parts of the Earth into integrant Parts of the Sea. Page 103 1. Part of the Earth covered with Water, and Part not. 2. The dry Parts feparated from each other by the Waters between. 3. Four great Continents enumerated. 8. The Peninfulas, Ifthmuffes, and Capes, or HeadLands. 9. Fourteen 9. Fourteen Peninfula's enumerated. 10. The more remarkable Iftmuffes enumerated. CHAP. IX. Of Mountains in general, and the Ways of taking their Altitude. Page 119 1. The Parts of the Earth are of different Altitudes. 2. To find the Height of a Mountain by Altimetry. 3. The Height of a Mountain being given, to find it's Distance from a certain Place. 4. The Distance being given from whence the Top of a Mountain is first feen to find it's Height. may be 5. The Height of a Mountain being known, to find the utmost Distance whereto it Seen. 6. The Sun's Height above the Horizon being given at any Time, and the Length of the Shadow of the Mountain at that Time, to find the Height of the Mountain. 7. The Height of Mountains bears no fenfible Proportion to the Semidiameter of the Earth, or does not hinder the Sphericity of the Globe. 8. To explain the Origin of Mountains. 9. Why Rains and watery Meteors are frequent on the Tops of Mountains, whilft it is fair below. 10. Whether the Surface of a Mountain be more capacious than the Plain it ftands on. CHA P. X. Of the Differences of Mountains. Page 135 1. Some Mountains are large, others small. 2. The more famous Mountains enumerated. |