1822.] 
mited, and free access of the surround- 
ing air allowed, does not decrease 
from heat, as appears by the Torricel- 
fian tube, Whiclis generally as high, or 
higher, in the hot month of June, than 
inthe cold month of January, when, on 
the principle which he assigns, it 
would invariably be lower. The heat 
of the air enables it to hold a greater 
quantity of moisture in solution, 
which, according to Sigma’s answer to 
the second enquiry, increases its 
weight and pressure. It must, there- 
fore, arise from the expansion of the 
air within, as is evident from the fol- 
lowing facts. First; thatthe convexity 
of the surface.and disposition to fall is 
always greater when the temperature 
of the air is high than when its density 
is little, a result that is easily ascer- 
tained by observing the phial barome- 
ter in hot and dry weatiier, at the same 
time with the common barometer and. 
thermometer; and, secondly, that a 
lamp, held at the top of the phial by 
the side of the space occupied by air 
produces a globular extremity to ‘the 
colunin of water mucli quicker than 
When applied at the same distance 
from the side of the orifice. 
From these circumstances, it ap- 
pears, that the phial barometer is a 
better test of the temperature than the 
weight of the atmosphere ; and its ten- 
dency, to indicate the former more 
than the latter, destroys its prophetic 
properties. As a therniometer, it is 
totally useless, because it cannot be 
graduated. But, although it will not 
answer the purpose of a barometer 
when consiraeted in the ordinary way, 
its defects can be in a great measure 
remedied by using a two-ounce bottle 
With a very small neck, which can be 
inverted with the loss of very litfle 
water ; and, of course, with the admis- 
sion of as little air. Your correspon- 
dents will then notice how slightly the 
heat affects if. 
In order to perform this little expe- 
fiment with greater nicety, and that 
its most delicate indications may be 
perceptible, the water should be de- 
prived of its brilliancy by tinging it 
with some colour that can be held in 
perfect solution. 
’ The cheapness and facility of ob- 
taining the phial barometer, if it can 
hy any means be brought to answer 
the proposed end, would make it a dé 
sirable implement to the husbandman; 
and, it is probable, your philosophic 
correspondents will make few sugges- 
-Montnty Mac. No. 373. 
Mr. Tudor’s Letters on Waless 
209 
tions of greater utility to the agricul- 
tural labourer than by pointing out 
such improvements to this simple in- 
strument as will render it a tolerable 
criterion of the weather. x. 
Totnes ; 10th August, 1822. 
— 
For the Monthly Magazine. 
LETTERS ON WALES, 
From Griffith Tudor, at Festiniog,* to his 
friend Frank Wilnot at Oxford, 
LETTER 1. 
Introduction—English Prejudices—Outline of the 
proposed Letters. 
Y¥ pear Frank. After a week’s 
bustle I am at length comforta- 
bly settled amongst my native hills ; 
and have, as yet, no cause to repine 
that I have exchanged the “learned 
ease” of Christ-church for the more 
majestic tranquillity that pervades 
this ‘‘ sequestered vale.” For a per- 
son of your temper and habits, I know 
the cloistered piles and venerable 
turrets of our alma mater have infi- 
nitely more charms than all the moun- 
tain scenery that every-where here 
rises in sublimity on the view. But, 
on the other band, my worthy friend, 
you must admit, that I haye strong 
motives which you cannot possibly 
feel, independent of any prepossession 
for the grand works of nature, for pre- . 
ferring these rude hills, with their clus- 
tering oaks, to the proudest and most 
finished structures that art can exhi- 
bit. Tor, you must not forget that I 
am now in the land of my fathers, and 
that too after a long absence, which 
has only served, as it were, to “ bind 
me to my native mountains more ;” 
and, if you could but feel how foreibly 
the “‘ hie amor, hee patria” of the poet, 
appeals to the heart of a Cambrian, 
you would do full justice tomy present 
sensations. But cnouch of this: it is 
time IT should proceed to the pur- 
pose for which I have now taken up 
my pen; and which, you will conjec- 
ture, is to redeem the pledge I gave 
on our separation. For refaining, as 
I do, all those national predilections 
which have been so often the object of 
your raillery, you will not wonder that 
* The vale of Festiniog, im Merioneth! 
shire, is, one of the most romantic spots int 
North Wales, bounded, as it is, by lofty 
hills shaded with towering forests, highly’ 
cultivated, watered by a gentle stream 
which runs through its centre, and termi: 
nating in a magnificent view of the ocean. 
. The elegant pen of Lord Lyttleton has, in 
some measure, converted this vale into 
classical ground, 
Ee I should 
