July 1828. 



Published the First Day of every Month. — Price 2s. 6d. 



THE 



PHILOSOPHICAL MAGAZINE 



AND 



ANNALS OF PHILOSOPHY: 



COMPREHENDING 



THE VARIOUS BRANCHES OF SCIENCE, THE LIBERAL 



AND FINE Arts, agriculture, manufactures, 



AND COMMERCE. 



NEW SERIES. 



No 19.— JULY 1828. 



B.Y 



RICHARD TAYLOR, F.S.A. F.L.S. M. Astr. S. &c. 



AND 



RICHARD PHILLIPS, F.R.S. L. & E. F.L.S. &c. 



icm5cm : 



PRINTED BY AND FOR RICHARD TAYLOR, RED LION COURT, FLEET STREET : 



And sold by Baldwin and Cradock ; Longman, Rees, Orme, Brown, and 

 Green; Cadell; Sherwood, Gilbert, and Piper; Simpkin and Marshall; 

 Underwood ; W. Phillips ; Harding; Highley :— and by Adam Black, Edin- 

 burgh ; Smith and Son, Glasgow : and Hodges and M' Arthur, Dublin. 



