Publijbed the Loft Bay of every Month, 

 [TRICE TWO SHILLINGS.] 



THE 



PHILOSOPHICAL MAGAZINE: 



' COMPHKHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 

 THE LIBERAL AND FINE ARTS, 

 AGRICULTURE, MANUFACTURES, ' 



AND 



COMMERCE. 



NUMBER XXIX. 

 OCTOBER iSco. 



ILLUSTRATED "WITH 



THE FOLLOWING ENGRAVINGS BY MR.LOWRY; 



i and a. Apparatus employed by Dr. Herfchel in his Experiments 



on the Separation of the Rays of Light and Heat. 

 3 A true Representation of the Ibis of the Antients. 



LONDON: 



,R1UTID BY DAVIS, W1LKS, AND TAYLOR, CHAKCERY IASE; 



FOR a. tilloch: 



And fold by Meflrs. Richardson, Cornhill; Cadkll and Davie*. 



Strand,; Debrett, Piccadilly; Symonds, PaCernoiler-iow ; 



Murray and H.ghl.y, No. 32, FWt-fireetj Bell, 



No u3- Oxford-ftreet ; Vbmnor and Hood, 1 oultry ; 



* Harding, No. 36, St. Jamcs's-ftreet ; Bell and 



BRADrvTE* Edinburgh; Brash nn<* Rtn», 



Klalgow i and W. Gu»&RT, Di»lin. 



