1890. | VEEDER—FORCES IN DEVELOPMENT OF STORMS. 57 
May 26, 1890. 
STATED MEETING. 
The President, Pror. H. L. FarRcuHILp, in the chair. 
Thirty-four persons present. 
Mr. E. E. Howe tt exhibited a section of an iron meteorite from 
Puquios, Chili, which showed upon its etched surface lines of disloca- 
tion or faulting. This and other peculiarities of meteorites were 
discussed by Mr. Howell, Prof. Henry A. Ward and others. Prof. 
Ward said he had found that meteoric iron cooled much more slowly 
than pure iron. He also referred to the statements that the Greenland 
irons which, were once supposed to be meteoric, oxydized much more 
rapidly under cover than out of doors. 
The following paper was read : 
THE FORCES CONCERNED IN THE DEVELOPMENT OF 
STORMS, 
By M. A. VEEDER, M. D. 
(Abstract. ) 
A notable feature of the distribution of atmospheric pressure is its 
belt-like arrangement. In the equatorial regions pressure is relatively 
low, increasing to a maximum in the vicinity of the tropics, and again 
decreasing toward the poles. In the northern hemisphere these belts 
of similar pressure have a common center, not at the pole, but ata 
point in latitude 70 degrees north and longitude 96 degrees west. 
Circles described about this point with radii of two, three and four 
thousand miles in length respectively, define with great exactitude the 
location of these zones, in the northernmost of which cyclones have an 
eastward movement, and in the next, anti-cyclones move eastward, but 
cyclones have little or no progressive movement in longitude, and in 
the third, which is known as the equatorial cloud-ring, storms remain 
stationary, or at certain seasons move westward. 
The common center about which these belts are arranged is the 
chief magnetic pole of the northern hemisphere. Auroras likewise are 
most frequent in a well defined belt described about the magnetic pole 
at a distance somewhat less than that of the center of the belt of east- 
ward moving cyclones. In the equatorial cloud-ring thunderstorms 
attain their greatest frequency, being of daily occurrence, thus belting a 
considerable portion of the earth in this location. 
