TO HIS UOTAL HIGHNESS 



PRINCE AUGUSTUS FREDERICK, 



DUKE OF SUSSEX, K. G. 



PHESIDEXT OF THE BOYAL SOCIETY, 



&c. &c. &c. &c. 

 THIS TREATISE 



IS, WITH PERMISSION, HUMBLY DEDICATED, 



AS A TRIBUTE OF PROFOUND RESPECT AND GRATITUDK 



FOR THE BENEFITS RESULTING TO 



SCIENCE 



AND ITS CULTIVATORS, 

 FROM HIS ILLUSTRIOUS PATRONAGE, 



BV HIS DEVOTED HUMBLE SERVANT, 



P. M. ROGET. 



•^ 4k : 



V 



?^1990 



