v CONTENTS, 



The Raijtng Pump. The Forcing Pump. The Sucking Pump.** 



The Compound Pump. The Fire Engine Motion of Water in 



Conduit Pipes. Qfcillatory Motion of Water in a Siphon. Ofcilla- 

 tory Motion of Waves. Motion of Wheels afied upon by Water, and 

 CcJiJiruclion of Water Mills. 



CHAP. IV. page 473. 

 Of tie Ocean. 



Saltnefs of the Ocean. Different Opinions as to the Caufe. Probable 

 Reafons why the Sea has been always fait. Temperature of the Sea 

 at different Depths. Modes of rendering Sea- water frejh. 



CHAP. V. page 481. 

 Of Rain. 



Recapitulation ofDoclrines relative to fptmtaneous Evaporation. Va- 

 pour by fame fuppofed to conjiji of hollow Vejides. Rain. Different 

 Theories of Rain. Snow. Hail. Rain which froze in coming in 

 contaft with the Earth. Large Hail-Jiones. Fogs, Dew. Hoar 

 Froft.Inftances of partial freezing when the general Temptrature 

 is above the freezing Point, 



CHAP. VI. page 491. 

 / Of Springs and Rivers. 



Origin of Springs. Digging of Wells.* Nature of Springs. Mar/bet. 

 Cheap and eajy Mode of draining them. Intermitting Springs. - 

 Rivers, Their Source, &c. 



CHAP. VII. page 504; 

 Hot Springs. 



Probable Caufef of thefe Phenomena. Abound moft in volcanic Re- 

 gions.- Hot Springs in Iceland, near Mount Hecla.-^At Geyfer. 

 In the I/land of Ifchia. At Viterbo. Explanation of thefe Pheno- 

 mena. Burning Well in Lancajhire . Explained. 



CHAP, 



