VI 



CONTENTS. 



V. A Model propofed for the Conftruftion of a Satellitian, or Inftrument for 

 explaining the Phenomena of Jupiteir and his Satellites, with an Account 

 ofitsUfe. By the Rev. W. Pearfon, of Lincoln — — p. laz 



Conftniftion of the inftrument. Reftification. Caufes of irregularity in the movements of Jupi- 

 ter's fatellites. Enumeration of phenomena difplayed by the fatellitian. General remarks. 



VL Objeftions to the Opinion of Profeflbr Spallanzani refpe£i:ing the Caufe 

 of the Light of Natural Phofphori, Communicated to Mr. John Fab- 

 broni, Sub-dire£lor of the Royal Mufeum of Florence. By M. Joachim 

 Carradori, M. D. . — — — . — — P- 132 



Scheele was the firft difcoverer that water abforbs oxygen from the atmofphere. Glow-worms, lu- 

 minous fliesj and fhining wood, give light under water, under oil, and in the barometric vacuum. 

 Luminous flies in oxygen : various obfervations and enquiries. 



VII. Sketch of the Hiftory of Sugar, in the early Times, and through the 

 middle Ages. By W. Falconer, M. D. F. R. S. &c. &c. p. 136 



The fweet cane mentioned as an article of commerce by Ifaiah and Jeremiah. Various accounts of 

 fugarfrom authors before Chrift. Artificial preparation lirft mentioned about A. D. 80, but doubt- 

 fully ; certainly as a general praftice about Tripoli, in Syria, in 1108. — Other authorities down to 

 the year 1170. 



VIII. Experiments and Obfervations on the Effe£l: of annealing a Plate of 

 Metal, confifting of fine or alloyed Gold, with one twenty-fourth Part of 

 Tin. By Mathew Tillet — — -^ — p. 140 



Account of Mr. Alcorne's Paper in the Philof. Tranf. for 1764, in which it is flated, the tin impairs 

 the malleability of gold very little, and that the univerfal opinion to the contrary was probably 

 founded on the prefence of arfenic. Preparatory experiment with fine gold and -^'^th tin, which 

 proved confiderably brittle. 



Accounts of Books — — — — — p. 142 



Philofophical Tranfaftions. Count Rumford's Effays. Sheldrake on the Club Foot, &c. 



JULY 1798. 



I. Memoir on a New Metallic Acid which exifts in the Red Lead of Siberia. 

 By Vauquelin — — — — p, 145 



The red lead ore boiled with carbonate of potafli affords the carbonate of lead, and a fait which was 

 decompofed by nitric acid, and afforded a peculiar acid. The fame ore gives its lead to diluted mu- 

 riatic acid, while the new acid is precipitated in a red powder. Charadters by which this acid dif- 

 fers from that of molybdena, and alfo from uranium, titanium and tungflen. It is reducible to a 

 grey, veiy hard, brittle, eafily ctyftaliizable in fmall needles, and not readily acidified by nitric 

 sicid. 



II. Far- 



