TO 



THE RIGHT HONOURABLE 



ROBERT VISCOUNT MELVILLE, 



FIRST LORD COMMISSIONER OF THE BOARD OF ADMIRALTY, 



&c. &c. &c. 

 AS AN ACKNOWLEDGMENT 



OF THE ENLIGHTENED LIBERALITY 



WHICH HE HAS DISPLAYED 



ON MANY PUBLIC OCCASIONS 



IN THE ADVANCEMENT OF 



ASTRONOMICAL AND GEOGRAPHICAL KNOWLEDGE 



THESE ILLUSTRATIONS 



ARE GRATEFULLY AND RESPECTFULLY DEDICATED 



BY THE AUTHOR. ^ 



