CONTENTS. 



CHAP. X. page 440. 



Of Sound. 



tmfiJertd in Three Points of View.- Caitfed ly a Vibration I'M 

 tb' Parts of Bodic;. Propagated by cni undulatory Motion of the 



jjir. . ^d by Experiment . Glaj/es broken by an Effort of 



- Elajl'.c Fluids not the o>:!> Meant of tranfmitiing Sound. 

 Water or folid Bodies convey it. Velocity cf Sound. Experiments 

 tn this Subjefi. Echoes. Whifpering Gallery. 



C ii A P. XI. page 450. 



Winds. 



Diffirtni Qpinians concerning the general Caufe of Winds. Of Genera! 

 'or Trade Wcudi. Of Monfoons Oj Sea and. Land Breezes. 

 Cattjes -of tbcfe. Variable Win/Is. Storms. Hurricanes. The 

 Harmattan. The Sirocco Wind. -The S ami el. Moving Pillars of 

 Sand. be Simoom. Whirl-winds. W at erfpouti, Tornadoes, 



CHAP. XII. page 475. 



Of the Heat of the Atmofphere, and Igneous Vapours. 

 Qbjeclf cf Meteorology as a Science. Partly anticipated. Tempera- 

 ture. Heat of the Earth. Effefis of the Sun's Rays on different 

 Mediums. ^Difference with re/pea to temperature between Land 

 and Water. E/etis of Clouds on the Temperature* Of Evapora- 

 tion. Unufual Cold, hmv produced in Summer find Winter. 

 Aqueous Meteors. Igneous Meteors. Fire Balls. Shooting Stars. 

 Ignes Fatui. 



CHAP. XIII. page 496. 

 Of the Prognoftics of the Weather. 



Jmperfefi State of this Branch of Science. Progmjtics of Wtatotrfnm 

 the pre-vious State cf thf Scajon.Frc;n the Undulations of the At- 

 mcfpbere.~-Fr6m the Barometer. F 'n m Fosrs.~Frcm Clouds. - 

 From Profptfis. From the Dw. From the $Jy+From the Moon. 

 From tbt Wind. 



CHAP. XIV.~page 507. 



Aeroftation. 



Hijlory of derogation. Difco-very of Air Balloons by M. M. Montgal- 

 Jier. Firji Balloon exhibited at siiinoni '}'. Balloon filled 'with in- 

 .. tamable Air exhibited at Paris. Pilatit lit Rozinr ajands in a. 

 Balloon. Firfl Balloon exhibited in England. Afent of M. Lu- 

 nar Ji Voyage cf M. Bland <ard and f>r. JrjJ'rLs acrofs the Chan- 

 ntL -Unfortunate Cat ajlrophe of M. M. de Rozicr find Romain. 



Mr. Baldwin's Defcr:ftion rf the Projfrrtfrom a Balloon Prin- 



dples of Aerojtation. Modes cf filling Balloons. Ufe 'to which tbej 

 beeve been, applied. 



