492 
The earthy portion insoluble in muriatic acid had the following 
composition :— 
Atoms. 
Sibcalwrmayiat ey. Dole sas te nov hele 
Alumina, .44) 535% jthe <>, 10:10 
Protoxide ofiron, 12:18 . . . . 0°34 
Time) Gates on econ le aicrk | metal oa b 1:66 
Magnesia,. . . 2403 . . . . 1:20 
99.98 
Omitting the alumina, the preceding analysis gives the rational for- 
mula of the Hornblende family 
4RO, 3810, ; 
and taken as a whole, it agrees with the analysis of many Hornblendes 
—the variety of Hornblende with which it has the closest relation is 
Anthophyllite. 
According to Mr. Greg’s catalogue of meteoric stones and irons, three 
other falls of aéroliths are recorded as having occurred in Ireland :— 
a. A. D. 1779; at Pettiswood, Westmeath ; 6 oz. 
b. August, 1810; Tipperary; 72 lbs. 
ce. 10th Sept. 1818, Adare, Co. Limerick; 17 lbs. + 65lbs. + 24lbs. 
Moving E. to W. sp. gr. =3.64. 
d. 29th April, 1844, Killeter, Co. Tyrone ; fragments of one stone 
sp. gr. =3'761. 
MONDAY, MAY 13, 1861. 
The Very Rev. Dean Graves, D. D., President, in the Chair. 
Tue Rev. William S. Burnside; Richard Hartley, Esq. ; John Hatchell, 
Esq.; D. Toler, Esq.; T. Maunsell, M.D.; and the Rev. Henry Joy 
Tombe; were elected Members of the Academy. 
Proressor Hennessy, F.R.8., read a paper— 
ON THE CONNEXION BETWEEN STORMS AND VERTICAL DISTURBANCES OF THE 
ATMOSPHERE. 
Storms are now fully recognized to result from antecedent abnormal phy- 
sical conditions of the atmosphere. The contact of unequally dense and 
elastic masses of air usually precedes every kind of storm. These dis- 
turbing conditions are themselves dependent chiefly on inequalities of 
temperature and dryness in the aérial strata. Were we able to observe 
these physical conditions simultaneously over a wide surface, and verti- 
cally in ascending over several points of an extensive district, we should 
be able to predict a coming storm from the observed conditions, quite as 
securely as a physician can prognosticate the ultimate results, by studying 
the symptoms of some well-known and frequently-recurring malady. But 
