384 CORRECTION TO BAROMETER FOR FORCE OF WIND. 
above the mean level of the sea 25 feet, the wind blowing with a force of 6 Ib. 
per square foot, the value of the corrections will be, 
Capillarity, . : : ; : : +021 
Temperature, ; : . : 5 —-023 
Capacity, . F d ; ‘ 3 — 007 
For altitude, ; ; : ; ; +°034 
Force of wind, ; ; ; 3 ; +:°035 
It will thus be seen that the correction for the force of the wind, in the sup- 
posed case, would be greater than any of those hitherto considered absolutely 
necessary for a strict comparison, and, consequently, that it is an element which 
cannot properly be neglected ; but I beg to repeat that I do not give the depres- 
sions corresponding to the force of the wind as absolutely determined, even for 
the short range I have observed; and it is possible that in towns and other shel- 
tered places, the results would be different. My object is to draw the attention of 
meteorologists to the facts stated, in the hope that by more extended observations 
we may obtain more accurate data; and it is important that their attention 
should be drawn to this subject at this time, when I trust we are on the eve of 
seeing established a uniform system of observation and registry for the world, 
under the sanction of the several governments, and promulgated by the authority 
of a congress of the most eminent men in meteorological science, from all parts 
of the world. 
The practical importance of the study of meteorology is daily becoming more 
evident by the results obtained by Mr Reprievp and Colonel Sir W. Rem from 
the study of the law of storms, by the results obtained by the wind and current- 
charts of Lieutenant Maury, the astronomer at Washington, and in the true in- 
dications, as I believe, which the isothermal lines give of the most accessible route 
to the open Polar Sea, and the pole itself, as explained by Mr Perermany, not to 
speak of the accurate data which meteorology gives us for understanding the 
peculiarities of the climates of the different parts of the world, the causes favour- 
able or otherwise to the health of man, or the necessary conditions for the suc- 
cessful cultivation of the different products of the earth, or the high interest which 
must ever attach to the purely scientific branch of this inquiry; but we can never 
arrive at a full understanding of these important subjects without that combined 
and uniform system which has been proposed. 
I cannot terminate these remarks better than by quoting the words of Pro- 
fessor DANTELL in “an urgent recommendation to meteorologists to use standard 
instruments, to observe them with care, and to make all necessary corrections for 
accidental differences; and, above all, to keep their tables on the same scheme. 
Much curious information is dependent upon such an extensive plan of compara- 
tive observation ; and, without it, the observer does little more than accumulate 
an overwhelming mass of crude and incorrect materials.” 
