i^ CONTENTS. 



III. Inftruftions concerning the Manufacture of Steel and its Ufes. By Van- 

 dermonde, Monge, and Berthollet. Publiflied by Order of the Committee 

 of Public Safety — — — — — p, 64 



Combuftibility of iron. Reduftion by charcoal. Combination of both. Crude iron ; white and 

 grey. Forged iron. Steel. Natural fteel — how manufaiEtured. Steel by cementation ; defcrip- 

 tion of the procefles for making it. 



IV. Obfervations chemical and economical on various Subjefts — P- 71 



Mutual aftion of nitrous and hydrogen gas. The urine of animals which feed on vegetables does 

 not contain phofphoric but benzoic acid. On wooden bellows and the blowing cylinders of 

 iron. Separation of fea fait by fpontaneous evaporation. 



V. An Analylis of the earthly Subftance from New South Wales, called 

 Sydneia, or Terra Auftralis. By Charles Hatchett, Efq. F. R. S. p. 72 



E.xamination of two fpecimens of the Sydney Earth, obtained from Sir Jofeph Banks ; one of which 

 was part of the very parcel formerly examined by Wedgwood. They did not exhibit the peculiar 

 properties announced by that chemift, and were found to contain much (ilex, with alumine, car* 

 bonet of iron, and 3 fmall portion of water, or volatile matter, but no other fubftance. The 

 Sydney earth muft confequently be rejefted. 



VI. The Method of making ftrong artificial Magnets. By M. Coulomb 



p. 80 



Method of the double touch. Improved by .^pinus. Particular inflruftions for the method of M. 

 Coulomb. 



VII. On the Separation of Argillaceous Earth from Magnefia. By Mr. F. 

 Accum — — — — ■ — — P- ^3 



Carbonate of ammoniac totally feparates the clay from a faturated marine folution, containing that 

 earth and magnefia. 



VIII. Extrafts from the Manufcripts of Leonard de Vinci. With Remarks 

 by J. B. Venturi, Profeffor of Natural Philofophy at Modena, Member of 

 the Inftitute of Bologna, Sic. — — • — — p. 84 



On the defcent of heavy bodies combined with the rotation of the earth. Hiftorical documents. 

 Experiment to fliew the earth's rotation. General effefts of gravitation. Lunar aftronoray. Cir- 

 culation of the ocean by heat. Theory of the earth. Combufli6n. Statics. Enumeration ,^of 

 the caufes which influence the quantities of water ifluing from an orifice. Law of circular ed- 

 dies in water. On viiion. Military architefture. Various iuftruments. The Greek fire. Pure 

 oil by maceration. Obfervations on method, &c. 



IX. Obfervations and Experiments on the Formation of Sulphate of Soda, 

 or Glauber's Salt, in Salt Waters, at a Temperature beneath the freezing 

 Point of Water, and upon an eafy Method of difengaging ail the dilique- 

 fcent Salts. By M. Green — — — P- 9^ 



Sulphate either of alumine or of magnefia decompofe common fait, if at a temperature below 

 freezing. Methods of clearing falt-water of every foreign fait, but fulphate of lime, which is 

 not hurtful to the fubfequcnt procefs. 



ji., A 



