432 Mr. S1x’s Experintents to invefigate 

that the degree of cold which had frozen the ‘furface of the 
ground, had not then afcended to the glafs, nor to the linen, — 
and confequently had not been communicated to the air five or 
fix feet above the earth. The next day I found, as I expected, 
a confiderable local variation; the index for the cold of the 
night in the garden being at 32°, that on the hill bemg 
at 35°3, and that on the top of the tower at 37°3 *. 
Probably the weather -did not continue clear the whole 
night; if it had, it is likely the:degrees of cold would have 
been found proportionally greater at every ftation. On the 
morning of the 4th there fella mifty rain, which continued 
only till noon, when the fky became clear again, and con- 
tinued fo tillthe 7th; during which time the nocturnal heights 
of the Pe i ik differed confiderably from each other ; 
but on the fky’s becoming cloudy, the local variation ceafed. 
Thermometrical obfervations, made under the fame cir= 
cumftances in refpect to the feafon of the year, place, and 
fituation +, may probably be liable to fimilar local varia- 
* Tt is remarkable, that the thermometer on St. Thomas’s hill did not vary 
fo much from that in the garden, as that did which was on the Cathedral tower, 
although thefe two elevated glaffes were within three feet of a perfect level with 
each other; the variations, however, as often as they happened, inclined the 
fame way. ‘The reafon of this might probably be, that although the glafs on the 
hill was at an equal altitude with that on the tower, in refpect to the ground on 
which the Cathedral ftands: yet the former was only 15 feet, while the latter 
was 220 feet from the ground. 
+ Situation in regard to hillor valley. The valley m which Canterbury ftands 
is at that place about a mile in breadth, opening tothe N.E.; the hills‘on either’ 
fide do not rife very fudden, nor very high; the river Stour, divided into branches, ” 

paffes through the city, and, about fourteen miles below, empties itfelf into the ~ 
fea, which wafhes the coaft from the NN.W. round by the E, to the S.; diftant © 
from the city at different places ‘from fix to fixteen miles, 
Ao 2 tions — 

