Date.

at Sea,
at

1822.

Thermometer, Temp. Hygrom. Lat. S. Long.

10 10 Daily
10 10
morn. even. range noon. morn. even. noon. noon.

W.

Winds.

at

at

19

23 25

Account of the State of the Thermometer, and of Leslie's

Hygrometer, observed at the Ports of Callao and Pisco, during the months of February, March, April, May, and June, 1823.

March 1823.

HYGROM.

THERMOM.
Mean of 10 A. M.

690.94

140.32
10 P. M.
67.36

7.53
10 and 10, 68.65

10 .92
15th,
Maximum, 16th, 73.0
19th, )

| 16th,
Minimum, 9th, ... 65.8 16th,... 1.5 at 10 P. 31.

15th; } 23.5

April 1823.

...

Mean of 10 a. M.

10 P. M.

10 and 10, Maximum, 26th, Minimum, 9th,

THERMOM. HYGROM.
699.31

150.81
66.20

8.22 67 .75

12.01 73.0 26th, 23.0

......

{ }

46677233

May

1 67.5 65.5 22.0 10.5 Clear. Wind SSE. Evening clear.

2

66.8 64.7 18.0

69.5 64.8 24.0 66.5 65.0 16.0 5 67.4 65.4 16.0

8.5

11.0

10.0

67.0 64.8 21.0
67.0 65.6 9.5

7.0

12.0 Do.
do. Evening very clear.
Rather cloudy. Wind SE. Even. clear & calm.
Clear. Wind NNW. Even. very clear & calm.
Clear. Wind S. Evening cloudy and calm.
Calm and clear; evening cloudy.

7.5

Clear. Wind S. Evening a little cloudy.

8

Clear. Wind SSE. Evening clear.

65.5 58.7

66.0 62.7 14.5

65.4 62.9 14.5

65.4|| 62.2 | 20.0
67.0 60.0 27.0
62.9 62.6 11.5
63.0 62.2 12.5
67.3 63.4 18.0
64.8 61.4 11.5

14

15

16

17

18

19

20

21

22

23

24

25

26

27

67.1 62.6 19.0

8.0

Clear. Wind NN W. Even. clear. Wind SSE. Cloudy. Wind SSE. Evening clear. 9.0 Clear. Wind S. Evening very clear & calm. 7.5 Clear. Wind SSE. Evening very clear. 11.0 Clear. Wind SSE. Evening rather cloudy. 9.5 Clear & nearly calm. Even. clear. Wind SSE. 6.0 Clear. Wind SSE. Evening very clear.

...

Hazy. Wind SSE.

6.5 Evening clear and calm.

15.5 6.5 Cloudy. Wind NNW. Even. clear & calm. 8.0 Clear. Wind NNW. Even. clear. Wind SSE. 7.0 Cloudy. Wind S. Evening clear. 10.5 Clear. Wind SSE. Evening clear. 10.0 Clear. Wind SSE. Evening clear and calm. 11.0 Cloudy. Wind SSE. Evening clear. 7.5 Clear. Wind SSE. Evening clear. 5.5 Clear. Wind SSE. Evening clear. 10.0 Cloudy. Wind SSE. Evening clear and calm. 8.5 Clear. Wind SSE. Evening clear. 9.0 Clear. Wind SSE. Evening very clear. 6.5 66.2 62.7 15.0 13.0

65.7 61.5 18.0

66.3 60.3 11.0 11.0

Cloudy. Wind SSE. Evening cloudy and calm. Cloudy. Wind NNW. Steady breeze all day, wind from the same quarter. Evening wind still NNW.; steady breeze. Cloudy. Wind NNW. Steady breeze all day, wind NNW. Evening clear and calm.

1

68.2 62.5 32.0 6.0
66.5 63.7 11.0

65.6 62.7 18.5 66.4 62.4 20.0 64.6 63.4 16.0 62.2 63.0 6.5 66.3 60.3 31.5 8 67.6 63.6 29.0

234567-23 1

67.5 58.0 34.0 10 65.7 62.3 22.5 66.4 63.7 14.5 65.6 64.3 17.0 | 65.5 | 63.0 | 17.0

12

13

14

65.3 63.8 15.5

11.0

15.5

REMARKS.

Clear. Wind SSE. Even. clear; light breeze.
Clear, and almost calm. Evening cloudy.
Wind SSE.

Cloudy. Wind SSE. Even. very clear & calm.
10.0 Cloudy and calm. Even. cloudy. Wind SSE.
12.0 Cloudy. Wind SSE. Evening cloudy.
14.5 Cloudy. Wind NNW. Evening cloudy & calm.
11.5 Clear. Wind SSE. Even. very clear & calm.
17.5 Cloudy. Wind SE. Evening cloudy and calm.
6.5 Cloudy & nearly calm. Ev. very clear & calm.
11.0 Clear. Wind SSE. Evening clear.

11.5

16.0

13.0 13.0

Cloudy.Wind NNW. Midday clear. Ev.cloudy.
Cloudy. Wind SSE. Evening cloudy.
Clear. Wind NW. Even. cloudy. Wind SSE.
Cloudy. Wind NNW. Evening cloudy.
Wind SSE.

Cloudy. Wind NNW. with very light rain.
Evening cloudy.

J Cloudy. Wind NW. Evening cloudy.
Wind SSE. with rain.

9.0 Cloudy. Wind SSE. Even. calm and cloudy.
f Cloudy. Wind NNW. Evening cloudy.
Wind SSE.

7.5

9.0

7.5

15.5

11.5

9.0

6.0

63.2 61.0 16.5 12.5

880

62.2 60.2 7.5 6.0

Clear. Wind SSE. Evening cloudy.
Clear. Wind SSW. Even. cloudy. Wind SSE
Cloudy. Wind S. Even. cloudy. Wind NNW.
Cloudy. Wind SSE. Even. cloudy. Wind NW.
Cloudy. Wind NW.; steady breeze. Even-
ing cloudy and calm.

Cloudy. Wind NNW. Even. cloudy & calm.
Cloudy and nearly calm. Evening cloudy.
Wind SSE.

Cloudy. Wind NW.; light breeze. Even-
ing clear.

Cloudy. Wind SW.; light breeze. Evening cloudy.

13.82

X.-Memoir on the Geology of the Snowdon

Range of Mountains, as connected with its Scenery, Soil, and Productions.

By JAMES STUART MENTEATH, Esq.

(Read 14th February 1829.)

Few countries have afforded more delight to the traveller than Wales, which may, in a great measure, be ascribed to the imposing appearance of its romantic scenery. But though few pleasures certainly can be more gratifying than those that arise from the contemplation of a varied landscape, yet this country will be found to furnish materials for observation of a more useful and interesting kind.

To the person who considers geology as connected with the improvements of agriculture, with the resources of a country, and with the changes which the earth's surface is made to undergo in the progress of the arts, this district will afford an ample field of instructive inquiry. As the whole of this country, however, would be too extensive a subject for a single paper, we propose confining our remarks to that district which is situate in the north-west corner of Wales, and which may be denominated the Snow

don Range.

VOL. VI.

оо