THE 



iPHILOSOPHICAL MAGAZINE 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, 



THE LIBERAL AND FINE ARTS, 



AGRICULTURE, MANUFACTURES, 



AND 



COMMERCE. 



BY ALEXANDER TILLOCH, 



HONORARY MEMBER OF THE KOYAL IRISH ACADEMY, &C. &C. &C, 



« Nec aranearnm sane textus ideo meli'or quia ex se fila gignnnt, ner norter 

 villor quia es alienis libamus ut apes." Just. Liis. Mumt. roliU lib. J. cap. i. 



VOL. XXVII. 



For FEBRUARY, MARCH, APRIL, and MAY, 1807. 



LONDON.- 



Printed hj R. Taylor attd Co., 38, Shoe Lane, F.eet Strett: 



And Hold by Messrs. Richardson ; Cadell and Daviils ; Longman, 



Hurst, Rees, and Orme; Symonds; Murray; Highieit; 



VtRNOR and Hood; Harding; London: Bill and 



Bkadfuti, Kdinburgh: Brash and Reid, and 



1). NivRN, Glasf^ow: and GiLBtaT 



aud HoucES, Dublin. 







