342 



crust and internal greyish-white crystalline structure and appearance, 

 with specks of metallic lustre, occasioned by the iron and nickel alloy 

 that was present. I analyzed it in the usual manner ; hut, owing to an 

 accident, I was unable to determine the composition of the earthy por- 

 tion soluble in muriatic acid. 



The following is the mineralogical composition of these Aeroliths : — 



1. Hornblendic mineral (insoluble in acid), . . 34*18 



2. Earthy mineral (soluble in acid), ... . 30 "42 



3. Iron, 25*14 



4. Nickel, 1 '42 



5. Sesquioxide of chrome, 2 '70 



6. Cobalt, trace 



7. Magnetic pyrites, 6 • 14 



100-00 



The earthy portion, insoluble in muriatic acid, had the following 

 composition : — 









Atoms. 



Silica, . . . 



55 



01 . 



. 1-22 



Alumina, 



5 



35 . 



. o-io 



Protoxide of iron, 



12 



18 . 



. 0-34) 



Lime, 



3 



41 . 



. 0-12 [ 1-66 



Magnesia, . 



24 



03 . 



. 1-20) 





99 



•98 





Omitting the alumina, the preceding analysis gives the rational for- 

 mula of the hornblende family, 



4 RO, 3 SiO 3 , 



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 an- 

 thophyllite. 



According to Mr. Gregg's " Catalogue of Meteoric Stones and Irons," 

 three other falls of Aeroliths are recorded as having occurred in Ire- 

 land :—= 



1. A. D. 1779, at Pettiswood, Westmeath ; 6 oz. 



2. August, 1810, Mooresfort, county of Tipperary ; 7f lbs. Spec. grav. — 3 '670. 



3. September 10, 1813, Adare, county of Limerick ; 17 lbs. + 65 lbs + 24 lbs. ; mov- 



ing E. to W. Spec. grav. = 3-64. 



4. April 29, 1844, Killeter. county of Tyrone; fragments of one stone. Spec. grav. 



= 3-761. 



Of the Meteorite that fell at Mooresfort, county of Tipperary, in 

 1810, the only analysis on record is one published by the late Professor 

 Higgins, in the forty- seventh volume of the " Proceedings of the Eoyal 

 Dublin Society," in whose Museum the greater part of this stone, and 

 a cast of the entire, are carefully preserved. 



Professor Higgins considered 35 per cent, of the stone to consist of 

 metallic particles separable by the magnet. This would include the 



