340 
Miscellaneous Notices . 
[Nov. 
Such was the view which suggested itself on first hearing of the failure of the ex- 
periment and relinquishment of the plan. Whatever doubts might have arisen as 
to its justness, are removed by the opinion of one every way qualified to judge. 
Mr. Walker, in the communication which is republished in our 8th number from the 
Philosophical Magazine, gives it as his opinion, that artificial ice is most economi- 
cally and effectually applied, by mixture with saline ingredients. 
4 . Table of the Comparative Tensions of Aqueous Vapor , for 30 degrees of depres- 
sion of a wet-bulb thermometer , and from 30 to 120 degrees of Temperature. 
Depression. 
Tem 
1 
2 
3 
4 
5 
6 
7 
8 
10 
n 
12 
13 
14 
io 
30 
83,8 
70,0 
56,2 
43,8 
32,7 
22,8 
14,3 
6,8 
0,0 
40 
87,8 
77,1 
67,2 
57 7 
48,8 
40,6 
32,9 
25,7 
19,3 
13,5 
8,0 
2,7 
50 
90,7 
82,3 
74,0 
66,5 
59.5 
52,4 
45,8 
39,5 
33,4 
27,8 
22.3 
17,5 
12,9 
8,7 
4,7 
CO 
02,6 
85,6 
78,7 
72,2 
66,1 
60,0 
54,5 
48,9 
43,4 
38 3 
33,4 
28,7 
23,3 
20,4 
16,6 
70 
94,0 
88,2 
82,5 
76,9 
72,3 
66,1 
61,2 
56,4 
51,8 
473 
42,9 
38, y 
35,0 
31,4 
27,5 
80 
94,9 
90,0 
84,8 
80,0 
75,3 
70,6 
66,4 
62,1 
58,1 
64,1 
50,0 
40,4 
42,8 
39,3 
36,2 
00 
95,6 
91,3 
86,9 
82,8 
78,7 
74,7 
70,8 
67,1 
33,3 
59,7 
56,1 
52,6 
49,2 
46,1 
43,0 
100 
96,1 
92,4 
88,8 
85,2 
81,5 
78,0 
74,6 
71,0 
67-8 
64,4 
61,2 
58,2 
55.1 
52,0 
49,1 
110 
96,5193,7 
90,0 
86,9 
83,7 
80,5 
77,3 
74,3 
71,2 
68,5 
65,5 
62,7 
60,0 
57,4 
51,7 
120 
96,9|94,0 
191,0 
88,4 
85,7 
82,7 
80,0 
77,1 
74,4 
71,7 
69,3 
66,7 
64,2 
61,6 
59,2 
Depression. 
Tern 
16 
17 
18 
19 
20 
21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
50 
60 
70 
80 
90 
100 
110 
120 
1,0 
12.9 
23,0 
32,6 
40.3 
46.3 
51.9 
57,2 
9,6 
20,6 
29,4 
37.3 
43.4 
49.4 
54,7 
6,5 
17.4 
26.4 
34.5 
11,0 
47,0 
52,3 
3,3 
14,3 
23.2 
31,7 
38.3 
44.4 
50,1 
0,3 
11,1 
•20,5 
28.7 
35.7 
42,0 
57.8 
8,6 
17.6 
26,1 
33,3 
40,0 
15.6 
5,7 
15,1 
23.8 
30.9 
37,5 
43,4 
3,1 
12,7 
21,1 
27.4 
35.5 
41,4 
0,04 
10.4 
18,8 
26,2 
33.3 
39.5 
7,9 
16,5 
24,0 
31,2 
37,4 
5,6 
14.4 
22,0 
29,0 
35.5 
3,3 
12,2 
20,0 
27,1 
33,6 
1,0 
10,0 
18,0 
25,2 
31,8 
7,9 
15,9 
23,2 
30,0 
5,8 
13,8 
21,2 
28,0 
The above is inverted from P’s table page 81, of the March Number of this work 
in which the following error of the press was discovered: for temp. 80, and ten- 
sion 10, read depression 24.1. instead of 25.1. q 
5. Whirlwind. 
April 15th, 182b. About 4. 30. P. M. in the vicinity of Dacca, after a heavy squall 
of wind which commenced at N. W. and afterwards shifted to every quarter of the 
compass, accompanied by a heavy shower of rain and hail, and tremendous peals of 
thunder without a single flash of lightning, which lasted for nearly an hour, I 
observed a very dense cloud to the S. and E. from which a column appeared to be - 
descending. On first perceiving it, it had descended but a short wav from the cloud 
in a slanting direction towards the earth, the part nearest the cloud being the thick- 
est, and the lower end gradually tapering away to a blunt point; it however increased 
rapidly in circumference., and gradually approached the earth, the point swelling out 
to nearly the same size as the rest of the column, and appearing, except at the 
upper extremity, (which was of the same denseness as the cloud) like a fine white 
smoke, rather denser towards the middle than at the edges, which were clearly and 
beautifully defined. After watching the formation for about a minute and a half, 
it reached the ground in the middle of a grove of trees, and immediately a cloud of 
dust was raised in the air, mingled with bamboos, mats, &c. and the whole dissap- 
peared ; the upper part appearing tobe drawn up into the clouds, and the lower falling 
to the ground. As it had the appearance of what is generally denominated a water- 
spout, I immediately proceeded to the spot, which was about two miles off, fully ex- 
pecting to find that a large quantity of water had fallen. To my great surprize I found 
there had not a drop fallen, and that the phenomenon in question, was a whirlwind 
winch had descended in the centre of a number of fishermen’s huts, twelve of which 
were entirely destroyed. The devastation was entirely confined to a space of about 50 
yards in diameter, and those houses berond the range of it, and absolutely almost 
touching the other, had merely the thatch of the roofs ruffled f the roofs of the 
