Universality of Cyclones. 189 
scribed, and that a correct opinion, founded upon this resem- 
blance, can often be formed of the approaching changes: an 
that the variations of the barometer resulting from the mechani- 
cal action of circuitous winds and the larger atmospheric eddies, 
pertain not only to the storms, but to a large portion of the winds 
in these and the higher latitudes. Vide this Journal for October, 
1833, (vol. xxv,) pages 120 and 129. 
The more inert and passive cyclones which seldom gain atten- 
tion, but which constantly occupy in their transit the greater 
portion of the earth’s surface, appear to move in orbits or courses 
corresponding with those of the more active class which have 
been traced on the storm-charts; a result that will not be doubted 
by those who have given careful attention to this branch of in- 
qniry. Ina broad view of the case, the constant occurrence and 
progression of the cyclones, in various degrees of activity, con- 
stitutes the normal condition of the inferior or wind-stratum of 
the atmosphere, at least in the regions exterior to the trade winds 
of the globe; to say nothing of their prevalence in the interme- 
diate region, where their presence is shown on some occasions 
by the most indubitable evidence. 
At the late meeting of the American Association for the Ad- 
vancement of Science, held at Cleveland, an ably elaborated pa- 
pet was presented by Prof. James H. Coffin, of Easton, Pa., on 
the relations which exist between the direction of the wind and 
the rise and fall of the barometer. By a careful analysis of these 
effects during all seasons of the year, as observed at various 
places in the north temperate zone, Prof. Coffin establishes the 
Such revision, I apprehend, is now imperatively required. For 
the constant r 
