CONTENTS OF VOLUME I 



THE LATITUDES AND LONGITUDES ...PAGE 527 j 



Definition of the Kipiator and Poles Northern and southern Hemispheres. L;it t-ide o'~ a Pla^e < 

 Parallel of Latitude. Meridian of a Place. Longitude of a Pluce. Standard Meridian Meth- ( 

 ods of determining Latitude and Longitude various. To find the Latitude Methods applicable ( 

 in Observatories. At Sea. Hadley's Sextant To determine the Longitude. How to find the 

 Time of Day at Laud. At Sea. Use of Chronometers Lunar Method of rinding the Longi- 

 tude Apparatus provided at Greenwich for giving the exact Time to Ships leaving the Port of 

 (London. Method of determining Longitude hy Moon culminating Stars. 



THEORY OF COLORS 541 



Kef -action of a Ray of Light. At plane Surfaces. By a Prism. The Prismatic Spectrum The 

 Decomposition of Light. Newton's Discoveries Colors of the Spectrum. Brewster's Discovery 

 of three Colors. How three Colors can produce the Spectrum Colors of natural Bodies. How 

 they are produced. 



THE VISIBLE STARS 551 



What occupies the Space beyond the Limits of the Solar System Wide Vacuity between this 

 System and the Stars. Indications of this observable in the Motions of the Planets Indications 

 in the Motions of the Comets. The immence Distance of the Stars proved hy the Earth's annual 

 Motion Observations made at Greenwich Bessel's Discovery of the Parallax. The conse- 

 quent Distance of the Stars Illustrations of the Magnitude of this Distance. The ditferent 

 Orders and Magnitudes of the Stars How accounted for. Why those of the lowest Magnitude 

 are most numerous The real Magnitude of the Stars. The Telescope unable to magnify 

 them Dr. Wollaston's Investigations of the comparative Brightness and Magnitude of the Stars 

 in relation to the Sun. Their stupendous Magnitude. Application of this to the Dog Star. 



WATERSPOUTS AND WHIRLWINDS 567 



Character and Effects of Water-Spouts. Difference between Water and Land-Spouts. Land- 

 Spoilt at Montpellier Land-Spout at Esclades. Columns of Sand on the Steppes of South 

 America Meteor at Carcassonne Meteor at Dreux and Mantes. Land-Spout at Ossonval. 

 Meteor witnessed and described by M. Peltier. Conversion of a Storm into a Land-Spout. 

 M. Pelt er's Tables of Water-Spouts and Land-Spouts. Analysis of the above Tables. Water- 

 Spouts .-ecu by Captain Beechy. Experimental Illustration of the Phenomena. Illustration 

 of the gyratory Motion of Water Spouts. M. Peltier's Deductions concerning Water Spo-.its. 

 Action of charged Clouds on light Bodies. Noise attending Water and Land Spouts. Trans- 

 ition from dire -4 to gyratory Motion. Effect of Induction on watery Surfaces Disappearance 

 of P.vVis, <kc. 



