iv CONTENTS. 



J)efaiptlon of an Apparatus in the Teylerian Mufeumfor the 

 Covibujiion of Phofphorus in Oxygen Gas; with Obferva- 

 tions on the Shining of Phofphorus in Azot. By D. Van 

 ISiIakvu of Haarlem r - Page S^ 



A fimple Method of determining the Magnifying Power of 

 Tclefcoj.es. By Mr, S. Varley. Communicated by the 

 Author ■ -> ~ - - 87 



Sixth' Communication from £)r. Thornton, Phyfcian to 

 the General Difpenfary, ^c. relative to Pneumatic Medi- 

 cine - - - - 9^ 



Biographical Memoirs of M. De Saussure. By A. P. 

 Dkcandolle - . - - 95 



Letter from Dr. Carmichiel Sjivth to the Editor of the 

 Philofophical Magazine - - r 103 



On the Longitudinal Fihrations of Strings and Rods, with 

 Obfervaiions on the Conveyance of Sound through Solid 

 Bodies. By Dr. Chladni of JVittemberg - 113 



Observations on the true Origin of the Goffamer. By J. M. 



BeCHSTEIN _ _ _ _ lig, 



Remarks on Mr. Sheldrake's Differ tation on Painting in 



Oil in the Manner of the Venetians. i>>' M?-. Edward 



. Daves. Communicated by the Author - 124 



Progrefs of Dr. Mi tchill's Mind in invefigating th& 



■ Cauje of the Pifilential Diflempers which vift the Cities 

 . of America in Su?n?ner and Autumn. Being a Develope- 



ment of his Theory of Peflilenlial Fluids, as publijhcd to the 

 • World in 1795; (ind the fucceeding Years [concluded.) ' 13^ 

 "jiccount of a Voyage to Spitjhergcn in the Year 1780. By 

 S. J3ac.strom, il/. £). Communicated hy the Author T39 

 An Attempt to arrange the Cryjlals of Oxidated Tift Ore, ac- 

 cording to their fuppofed Structure. ^ iV/r. William 

 Day, Leice/ler Place. Conwiunicated by the Author 152 

 Juxperimenls refpeBing the EffeBs of Quickjilver on Vegetable 

 Life. By Von Deimann, Paats Van Trostwyk, 

 flw<^ Lauvverenburgh - - - 161 



pbfervations on Animal EleBricity ; being the Subjlanee of 

 two Letters from A. Volt A to Profefjbr Gren 163 



Qn the Method of mamfatluring Acetat of Copper, Cryjlal^ 

 of Venus, or CryjlaUfed Verdigrife. JSyJ.A. Chap- 



■ TAL _ _ _ ' , xy, 

 An Attempt to determine the true .Form and 7icceffary Angles 



of Weather that ought to he given to Vanes of a Vertical 

 Windmill as they recede from the Centre, left undetermined 

 hy Mr. Smeaton. By Richard Hall Gov/er, in the 

 Sea Service of the Honourable Eajl hidia. Compa7iy 17^. 

 On the A faying of Iron Ores and Iron-Stones by Fifion. B)/ 



M'r. 



