OF CORNWALL. 5 
The lateft obfervations relating to the Latitude and Longitude of 
the principal head-lands of Cornwall, viz. the Lizherd point and 
tne Land s end, do not exadtly agree. 
The Lizherd is reckon’d by 
Latitude. Longitude from London. 
Dr. Halley 49 0 * 55 m 5 ° 3 o” 
Martin 49 ° 45 m 5° 36” 
Chart of Mount’s Bay "49 0 33“ 5° 26“ 
Renlhaw 0 - 49 0 47 36* 5 0 36 » 
The Land s End is reckon’d by 
Dr. Halley 30 0 3'" 6° y m 
Martin 49° 56” 6* 6 m 
Chart of Mount’s Bay 49 0 $g m ^o" 3 0 55" 
Renlhaw” 50 0 0 m r6 m 
CHAP. II. 
Of the Air , and Weather. 
A S the Situation of Cornwall approaches fo near to that of an 
I and, it mult be fubject to all the difadvantages as well as 
reap the benefits of an Ifiand-fituation. No Air is abfolutely pure, 
or free from exhalations ; Heat, whether it proceeds from the ele- 
mental fire of all bodies, or from the power of the Sun and Stars, 
^ perpetually railing into the Atmofphere Steams of Earth and 
ater; and in proportion as either of thofe Elements prevail, the 
r J °li n Tn S * 7 ' luitabl X rc P^ ete w hh vapours ; confequently in 
r - 1 an Sy t an< ^ u pon the Sea-coaft, where the area of Water is 
upenour to that of Land, the Air mull be moifter, (other circum- 
. anCeS ein § e fi ua] ) ^an in great tracks of land, and the Weather 
in geneia moie ubjcct to rain q . And fo we find it indeed in 
Cornwall, where a dry Summer is a rare thing; and when other 
^ ai ts 0 . n S] anc blbcr l T drought, Cornwall has feldom reafon to 
COm P ain : ^ ls tlllc 110 ru i e with regard to Weather fhall always 
others Ub ' :A ' d by Di °n. Williams, furveyor, 
.• L ^ e Chart of the Chanel from the obfei 
T e 111 f aftual Purvey, by Renlhaw 
others, about the year 174.1. 
F) SV n ° tK \ ^ lart ’ Lid to be corrected 
Dr. Halley and publilhcd in t 7 2i, the Liz! 
is in 49— 5 b. and the Land’s end in 50—6 » 
Longitude not noted. In the Dictionary of Arts, 
&c. publifhed in 1 754, the Lizherd is plac’d 
in Lat. 49 — 50. Long. 5 0 — 47 111 . all Arguments 
that this chief point of England’s Chanel has never 
been decifivcly laid down. 
q For this reafon the feafons in the Orcades are 
reckoned to be very rainy. 
c 
obtain 
