(Jan. 
vations 
In the 
of the 
rst sur= 
ount of 
nt with 
F multi- 
nenta) 
ison, of 
Martin. 
ugham, 
in the 
juate to 
ith erys= 
ng these 
between 
| by the 
Ie 
lel plates 
ith of an 
little, till 
ated from 
ved upon 
inces the 
parallel 
d whitish 
en light. 
reflecting 
yn of any 
a balsam. 
common 
an action 
e inclina- 
he thick- 
tion; and 
id inverse 
f inclina- 
& xplained 
mission of 
1 by thin 
ns placed 
hed in the 
le merely 
mpting to 
id fringes. 
Sir Isaac 
produced, 
Plate XLIL 
£ THUNDER S$ HORM of the 11" April, 1806 . i. THUNDER STORM, of the 14 May. 
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4H. a RADY, inthe 17:5 May IN SNOW, on the 3" March 
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