398 Proceedings of the British Association 
the vapor is condensed! It does not appear from the atmospheric cur- 
rents which preyail, that any portion of the vapors of the southera hem- 
artery passes intO-the northern, to. ‘be’condensed within or near to the 
basin of the Pacific, and there is no'reason to suppose that it does ;— 
sts i in the basin: of the Atlantic it is ‘sufficiently evident that vapor does 
not so pass. The vapor which passe$ over the Northern Atlantic, and . 
is condensed beyond the British Isles and Norway, is supplied from the 
eae ee a 
t tropical and other seas north of the equator. The West Indies eon- 
Pea siule the principal. point of departure of this vapor, and in the month 
~~ of January it is carried by southwestern and western winds to those lo- ‘ 
" cates where. the: isothermal lines advance farthest towards the pole. 
> 
oY 
o. 
5 
< 
- 
Ss 
o 
= 
oO 
Oo 
° 
5 
Qa. 
oO 
i] 
wn 
Ps) 
pnd 
° 
3B 
° 
= 
oad 
a 
< 
bo) 
Saee] 
° 
ban 7 
» 
i] 
> 
5 
° 
-~ 
os 
o 
ed 
= 
oO 
—_— 
ie condensation on the’: fof; the former, whilst there is much 
about the latter. Indeed, ests we know, condensation of vapor is 
_ the only influenc that operates: ‘exclusively on the eastern coasts of the 
ee chemical action which converts sucacritaeel ‘su berenée into a 
Tiquid, and Comegucniy changes the heat from a latent to an active 
state. The greatest irregular rise in the, isothermal lines is found in the 
: “winter of she bsthern hemisphere, - just at ibe time that the condensa- _ 
on of vapor produces the greatest effect. ‘on the» temperature hae 
the same temp i 
densation of wae is, S the. cause’ of. the rise of the isothermal: pe 
the parts, Pe ite 
On the Argunen for the P huiatoal i ection of Double a deaieed 
easy. of, Probabilities ; ; by Prof. For 
“The oe read'a passage fr from Herschel’s ‘ Outlines of Astronomy,’ 
-where thi is argument is set forth. ‘Mitchell, in the year 1767, in a pa- 
per in the Philosophical Transactions, was the first who advanced this 
“argument. He calculates the odds as 500,000 to 1 against the stars 
which compose the group of the Pleiades. being foniaincuby concentra- 
i ‘i the space they occupy, ahd thence infers the probability of 
3 
i 
= 
® 
— 
=) 
_ 
n. 
Se. 
= 
R 
2. 
a 
Q 
™ 
“yy 
=) 
° 
= 
o. 
3} 
oS 
=a 
® 
2 
i) 
af 
- 
® 
= 
a 
C 
a=) 
and more have since been added to the list. Again, he calculates the 
against any two stars of a number fortuitously scattered, falling 
