Pubhjhed the Loft Day of every Months 

 [PRICE TW'O SHILLINGS.] 



THE 



PHILOSOPHICAL MAGAZINE. 



N U MB E R XVr. 

 SEPTEMBER 1799. 



ILLUSTRATED WITH 



THE FOLLOWINXJ ENGRA^VINGS BY MR. LOWRT. 



I. A Plate to illuftrate the comparative Height bf the^ IVIoua- 

 tai'ns of Venus, the Earth, and the Moon; according to the 

 Obfervations of M. Schroeter of LihenthaK 



z. C. Regnier's New Powder-proof for afcertaioing the com- 

 parative Strength of Gunpowder. And a microfcopic re- 

 ^refentation of certain Animalculae found on the Surface of 

 a Fifli-pond in Norway, which gave it a Red Appearance. 



LONDON: 



(RIHTED BY J. DAVIS, CHANCERY^LANE > 



FOR A. tilloch: 



And fold by Mclfrs. Richardson, Cornhill; CAo'feLL anc!D[AVi£5j 



Strand; Debrf.tt, Piccadilly; Svmonds, Patcmofler-rowj 



Murray and Highuey, No. 32, Flcet-ftreet; Bbll« 



Ne. 148, Oxford-ftrect; Vernor and Hood, Poultry; 



l^ARDiNO, No. 36, St. JajntsVftrcet J Westley, 

 , No. 159, Strand i J. Remnant, H'\gh-ftreet, 

 Bloomlbury ; W. Gilbkrt and Archer, 

 • Dublin; and W. Reunamt, 

 Hamburgh. 



