so 
REPORT—1847. 
asceitaioed wbat should be the effect of a unifonn soa heotbg a clear fata Hu. 
sphere. This will give a curve owing to the chief causes, as the elliptic cure ofBr 
earth's motion round the sun is owing to the law of gravity towards lie sm. iis 
as the cartli’s ellipse is perturbed by other causes, so this curve will be pfftsrfwit 
the inoqusiity of the sun’s heat, by ibe presence of clouds and vapour, aodbtvai 
Ibe value of these perturbing causes may then he easilv ascerhunnl. 
solar radiation is very imperfectly understood, it was found better tosscBtab 
night in the first instance. From sunset to sunrise the earth boms 
ally cooling by radiation; and on a calm cloudless night ought to coot naSf*- 
cording to the Newtonian law. And if a single coefficient can be ascCTtsiiiri,iifai 
coetBcient will depend upon the radiating power of the fields, tr«s, liooe,te 
araund, the heat at sunset being given, the mrm of the carve can BhrspUtnf' 
tamed for any clear calm night. Reversely from the obeervations on sodi d* 
calm times, the coefficient of radiation can be detcffnioed. Thus the carveofitflf. 
calm time being determined, the value of the perturbations froro winds udwde 
**ccrtained from the observations. The law of pertnrbatioos thus Wf- 
mined, they may be deducted from the octual curve of the day- Thus tb« 4^ wk. 
ow'ing only to solar and terrestrial radiation, may be formed, and ihos 
M ar ramatnm deduced. To npply this it was oeceKson' in the first place toodi* 
tfto winds. Time did not permit any explannHon of this analysis; butoncaevlw 
with regard to tlie wind much nasisted this iavestigation, and deserrs 
Uy comparing a great number of ahip-logb. Commander Young. I.N., h» M 
♦ Indian seas. From these it appears that the 
iraae^ being drawn above the etjuator in the month of Mar, in confomitf™ 
8 Jaws, becomes a 3oiith-west wind, and following the bendof lhe.yn«*»^ 
rabiaa coasts becomes the south-west monsoon. This stream crosses the 
It the Africati coast and 6<jP of longitude. It meets the peninsulsof hiil*® 
**?L uJirr Howing in a »outh-wcstcrly course nearly in a straight line, tt ^ 
i^tb or which It curves upwards, and to the south of which it curves sera W 
^ circulato round the Maldive laiauds, to the south of wbeis 
•gmn becomes a south-east trade. 
*^rnethtng with regard to the uniformity of ffif *>1® 
■un'* * have been carefully exatnined, and their 
Iciwrit « 'This has led to a classification of the spots 
Siin» and priaciplcs of Sir W. HcrscheL Thefin«»^ 
ahuu<Ji«n» . formed by Hlrnng uruptions when the luminofunpi^I* 
atmoiii.K»r!..^»1 eruptions under the same conditions M the 
wrak erimHnn strong eruptions when the supply«weak; thefoor^ 
conseoiiertlt-'fi,*^'^'^'^*^ state. The last two are tberoost eoa^ 
sun?*A.nd thPF,.r number of spots, the weaker is the lumuiMi V 
number of Ann! cul^latiuns and statements which have shown tbatsp^ 
Z y^^ars is not contrary to Sir William HencW^ 
njalc of this imm.rt ” in exact conformity with it. Thus, ^ „ 
P unt elL*ra«it may be formed by a careful study of the soUr*?**^ 
-AWice of Observations carried on at f/i* Keto Ohervotom- 
^ F. Ronalds. 
mad/'a^Se volume of obsen-ations and 
Ko"*Mated that his preliminary 
bamm^cS? Md The'^W? atmospheric electrometer, the 
pohlishivl An,I ^^‘^imation-maguet bavine been (long since) 
•Pl«r.,^l'„r a dSrlhP"? "“"“S tt.cct add .ro»Wr"f 
m«‘ter ^ convenient character ; a declmation-magoft 
'^'theut at Kew, which scrupulously fulfil the requisite 
’*’bich have hithi'rt tion of those* friction-rollers, levers, pivots, or cthff" 
that it lit hia intoiit!n*i^°*^®^®' apparatus so objectionable- - 
like priuciolcs fnr • 1° during the ensuing year, complete 
instruments os he as many of the other meteorological wwi i 
have the means of doing; and concluded by 
