U^KMBli^Ui 



436 



ILLUSTRATIONS OF THE 



doubt from obfervations made at no very great 

 dillance of time, might be fufficient for his pur- 



pofe, though a flow change had been all the 



while going forward. Such obfervations could 



bell have little accuracy, and could 



b 



affeded by fmall 

 the change, that 

 age applicable, i 



'ariations. It is the flownefs of 



L 

 W 



makes the experience of one 



th 



innumerable other 



ftances. to the obfervations of th 



If 



long interval is taken, v^e will look in vain for 

 the fame uniformity of refults. A pilot, who 

 would at prefent judge of his poiition in the 

 German Ocean, by comparing his foundings with 

 thofe takenbyPir iHiiAS, (fuppoling them known) 

 in his navigation of that fea, more than 2000 



r 



years ago, could hardly be expected to deter- 

 mine his latitude and longitude with gr£at ex- 

 adnefs ; and I know pot if the moft zealous 

 advocate for the immutability of the earth's 

 furface, would be willing to truH his fafety in 

 a Ihip that was guided by fuch antiquated 



rules. 



Note 



ions 



) 



vv 



iiencen 

 ijfers t( 



lA 



PU 



Je pel 



■jie pri 



r 



iemati 



I * 



nations 



re cor 



altei 

 its of 



f* * 



ition, t 

 k Ion 



tion ; ; 



lorter 



Slid re( 



\ th 

 Jatiou 



f 



'■( 



itfti 



in 



