1849.Wet
Days.		Evaporation
Gauge.		Prevailing
Winds.
Two Daily
Observations.		Force
of
Wind,
0-5.
Inches
Jan.20·909SW.3·2
Feb.121·024SW.2·1
March131·558SW. & NW.2·1
April162·620Easterly.2·5
May143·886SW.2·0
June105·076SW.1·9
July184·156NW.2·3
Aug.192·657SW.1·4
Sept.123·337E., Variable1·5
Oct.171·723SW.2·3
Nov.24·960SW.2·4
Dec.15·793E., Variable1·8
Means19028·699SW.2·1

HYGROMETER.

At 3h P.M.
1849.Mean
of
Dry
Bulb.		Mean
of
Wet
Bulb.		Mean
Dew-Point
Deduced.[25]		Complete-
ment
of Dew-Point.
°°°°
January40·2839·0236·683·60
February44·6642·5040·084·46
March45·8543·1740·025·82
April48·6643·9439·139·53
May58·7952·8548·3910·40
June60·2353·4448·6811·54
July63·1357·4753·829·30
August62·4357·7754·597·84
Sept.61·9556·4852·879·08
October51·1748·1345·096·06
November46·6545·1043·233·41
December40·2538·7436·403·79
Means,52·0048·2144·917·07
1848,51·9348·2344·986·95
1847,51·9444·127·82

[25]From Mr Glaisher's Hygrometrical Tables, the accuracy of which myown series of observations made in the years 1847 and 1848, for the purposeof testing their correctness, shew in a very striking manner; and Ithink every meteorologist must feel himself greatly indebted to Mr Glaisherfor this valuable compilation, which is also based on observations made underhis own superintendence at the National Observatory.
In eight months of the year 1847, the difference between the observed andthe deduced Dew-point at Whitehaven, is 0°·10; and in 1848, it is only0°·07, the mean of the two periods comprising 1220 observations, amountingto the comparatively evanescent fraction of 8/100ths of a degree. Suchsatisfactory proofs of the perfection of Mr G.'s tables have induced me toabandon Daniell's Dew-point Apparatus, for that more simple, less costly, andequally correct form of Hygrometer, the combination of the dry and wetbulb thermometers.

Weight of
Vapour.
1849.In a
Cubic
foot
of
Air.		Required
for
Saturation
of a
Cubic
foot.		Degree
of
Humidity,
(complete
Saturation
=1·000).		Weight
of a
Cubic
foot of
Air.
Grains.Grains.Grains.
January2·800·320·899546·2
February3·040·570·844546·8
March3·030·720·811543·7
April2·871·230·701535·1
May3·931·730·696527·2
June3·911·990·663527·8
July4·701·770·726522·6
August4·851·500·767523·2
Sept.4·551·710·728523·7
October3·580·870·804533·8
November3·410·430·888538·8
December2·710·410·878548·1
Means,3·611·100·784534·7
1848,
1847,

SOLAR AND TERRESTRIAL RADIATION.

Absolute Minima.Mean Nocturnal Temperature.
1849.Six's Thermo-
meter,
4 feet
above
Ground.		On GrassOn Wool
on Grass		Six's Thermo-
meter,
4 feet
above
Ground.		Naked
Thermo-
meters
On Grass		Naked
Thermo-
meters
On Wool
on Grass		Naked
Thermo-
meters
Difference
°°°°°°°
January,18·704·002·835·8230·3527·712·64
February,30·020·518·040·0735·3833·082·30
March,28·019·514·739·9634·8832·602·28
April,29·021·316·038·5132·7228·883·84
May,36·526·022·045·8539·2736·273·00
June,40·529·525·048·5541·0637·863·20
July,46·033·029·053·7445·5242·433·09
August,46·535·031·555·0349·2046·053·20
September,42·531·828·050·4842·8439·533·31
October,34·024·518·543·1137·1533·463·69
November,27·719·514·542·7737·7935·722·07
December,25·017·511·535·9330·2927·083·21
1849,33·723·518·844·1538·0435·052·98
1848,32·520·243·7935·73
1847,33·720·543·5035·95
1846,36·123·1
Terrestrial Radiation.
Maximum.Minimum.Mean.
1849.On Grass.On Wool
on Grass		Day.On GrassOn Wool
on Grass		Day.On GrassOn Wool
on Grass
°°°°°
January,14·721·53d1·01·57th5·478·11
February,11·513·017th1·51·53, 22d4·696·99
March,14·516·031st0·01·511,12th5·087·36
April,11·517·511th3·03·03d5·799·63
May,12·017·51st1·52·515th6·589·58
June,14·019·54th2·03·526th7·4910·69
July,16·020·016, 17th3·04·04th8·2211·31
August,19·022·04th2·03·026th5·788·98
September,13·018·527th2·02·516, 20th7·6410·95
October,14·021·017th0·01·025, 30th5·969·65
November,10·513·224, 28th1·51·58th4·987·05
December,17·521·04th0·00·58th5·648·85
1849,14·018·41·462·166·119·09
1848,15·91·948·06
1847,15·11·14[26]7·45
1846,14·61·35[27]7·45
[26]In 1847, the Thermometer was on Cork throughout the year. It is here reduced to the Standard of Raw Wool.
[27]In 1846, the Thermometer was placed on Cork in cloudy and wet weather. The results are reduced to the Standard of Raw Wool, by adding0°·25 to the recorded annual mean.
In Sun's Rays.
1849.Max.Mean.Solar
Radiation.[28]
°°°
January,5945·503·37
February,6754·408·49
March,7761·314·51
April,9369·319·57
May,13388·027·49
June,10689·227·67
July,10696·332·37
August,10485·821·75
September,10281·118·54
October,7564·912·74
November,6750·903·05
December,5644·102·41
1849,87·069·215·99
1848,
1847,90·271·017·15
1846,
[28]Difference between the mean maximum in the
Sun's rays, and the mean maximum in the shade.

Form, &c. of Instruments.

The Barometer (the frame of which is brass) is a standard made by Barrow, under the direction of James Glaisher, Esq., of the Greenwich Observatory.