N T E N T 



CHAP. VII. page 5 5. 

 Of the Mechanic Powers. 



Machines. The Lever. The Pulley. The movefile Pi- 

 . Of Wheels. Clockwork. Beji Mode of conJlruSing tfo 

 Wheels of Carriages. The Wheel And Axle. Tht Crane. Tbt 

 Capflan.The Crick or Jack. The inclined Plane. Motion of 

 Carriages up an inclined Plane, &c. The Wedge. Tbt Screw.* 

 The perpetual Screw. 



BOOK II. 



OF THE NATURE OF FIRE, 



CHAP. I. page 86. 

 Hiftory of the Difcoveries relative to Fire anel Heat. 



Opinions of the Ancients. Of Bacon, Boyle, and Newton.-*- Of How* 

 terg, Sgr-atvefend) and Lemery.-^ 'Invention of the Tbermotne-ter*.-***- 

 Opinion of Botrbaave. Great Difcovery of Dr. Bl*cL 



CHAP. II. page 93. 

 Of Fire (Caloric) and its Properties. 



Inquiry whether Heat or Fire is a Sue/ft ance or Quality. Fire a $x$>~ 

 fl once. Application of this Doclrim.-^ Analogy between Heatanl 

 Light. QbjeSions.-Properties of Fire or Caloric', Minutenejs 

 of Particles ; at trailed by all Bodies. Conducting Powers -of dif- 

 ferent Bodies, Caufe cf Fluidity. Why Heat is produced by 

 flacking Lime, and by certain Mixtures of cold Subjlances. Freez- 

 ing of Water by the Fire Side explained. Fire the moft elaStf 

 of <dl' Bodies. 



CHAP. III. page 108. 



Of Expanfion. 



Experiments proving the expanfeve Force of Fire, or Caloric. Infirm 

 mentsfor mtafuring Degrees of Heat. Thermometers. Dr. BlacVt 

 Mode of meafuring high Degrees of Heat. Mr. Wedgwood 'j. 



CHAP. IV. page 1 1 6. 



Of Fluidity. 



Caloric equally the Caufe of Expanfeon and Fluidity. Phenomena of 



Bodies poffing from a folid to a fluid State, and the contrary .In- 



tenfe Cold of the Southern Hemifphere explained. Diflin^iion between. 



> '* and Fllli ' iit J*"~ Ex t eriments M*ftrative of the Dodrine of 



