contents/. V 



X- A Report made to the Council of Trade and Mines in Spain, on a new- 

 Kind of Wood, for dyeing, named Paraguatan. By D. Dominique Gracia 

 Fernandez, Infpeftor of Coinage — — — P- 93 



Examination of Paraguatan with acids, alkalis, alum, and other reagents, and in dyeing proccfles. 

 Its great utility. 



Scientific News — — — — P- 94 



The government of France offer for fale the paintings, &c. of Italy. Account of the fociety of 

 civil engineers. 



JUNE 1798. 



I. Abflraft of a Memoir on Camphor and the Camphoric Acid, read to the 

 Firft Clafs of the National Inllitute of France. By Bouillon La Grange 



P-97 



Hiftoiical fafts. Procefles for decompofing camphor — by deftniftive diflillation with clay — and 

 wiin aliimine. About one-third comes over in the form of a volatile oil, aromatic, yellow, eva- 

 porable, combinable with alkali, with alcohol, affording no precipitate by oxygenated muriatic 

 acid. Carboiie lemains in the retort, apparently combined with the alumine. Attempt to combine 

 a volatile oil witn carbone. 



II. Infl:ru£\ions concerning the Manufacture of Steel, and its Ufes. By Van- 

 dermondis JMonge, and Berthollet. Publilhed by Order of the Committee 

 of Public Safety. Concluded from Vol. ii. p. 70 — — p. 102 



Procefs for m?king c. fl-fleel at Sheffield. Properties of the different kinds of fleel. Method 

 of diftinguillnng itecl from iron by a drop of weak acid. Whether carbone be the only addition 

 to iron in ine Heel-making procefs. Obfervations on hardening fteel. Manufaflure of fleel- 

 rollers. Dft; adanon of fteel and of cafl-iron in the fire. Simple fufion with a viireous.flux will 

 not atford the Englilh cafl-fteel. Difference between tenacity and hardnefs. 



III. An Enquiy concerning the Source of Heat which is excited by Fri6lion. 

 By benjamin Count of Rumford, F. R. S. M. R. I. A.. — p. 106 • 



Great heat produced in boring brafs cannon. Enquiry whence itcomes. Experiment Ihews that 

 the capacity of the metalhc chips for heat is not altered by the procefs. Defcription of an appa- 

 ratus in which heat was produced by the flrong friftion of a blunt borer againft the bottom of 

 a cylindrical cavity in a mafs of metal. Admeafurement of the heat. Repetitions of the experi- 

 ment, in which the air was prevented from communicating with the rubbed furface. The opera- 

 tion being performed under water, caufed two and a quarter gallons of that fluid to boil. Eflimate 

 of the total quantity of heat which was generated and of the number of wax candles which would 

 have afforded the fame quantity in the fame time. Reflexions on the confequences to whicii 

 thefe experiments appear to point refpefting the exiflence of an igneous fluid or matter of heat. 



"VI. An Attempt to difcover the Genuinenefs and Purity of Drugs and Me- 

 dical Preparations. By Frederick Accum — — — p. 118 



Examination of faline fubftances. Sulphuric, nitrous, acetic, acetous, boracic, tartareous, karabic 

 and benzoic acids. 



V.A 



