536 Mr. It. P. Greg on some Meteorites 



former again is unsurpassed in its suite of meteorites from the 

 Austrian dominions, the latter in those from India. In each 

 collection, moreover, are to be found many desiderata which the 

 other can supply; and it is to be hoped, for the sake of science, 

 that a generous system of exchange may be adopted, and that a 

 friendly rivalry may be the means of perfecting with mutual 

 satisfaction the splendour and utility of these two great collections, 



Stones. 



1. Nulles. — An account of the fall of this meteorite is given 

 in a curious pamphlet entitled Lithologia Meteorica } written by 

 Dr. D. Joaquin Balcells, Professor of Natural Philosophy of the 

 Industrial School at Barcelona, and published at Barcelona in the 

 year 1 854. The fall of a great number of stones occurred between 

 the villages of Nulles, Vilabella, and Tarragona, some 15 or 16 

 leagues S.E. of Barcelona, on the evening of the 5th of Novem- 

 ber, 1851, the sky being at the time free from clouds. A fireball 

 was first seen high up in the east, which seemed to take a S.W, 

 direction, leaving behind it a luminous tail, which changed into 

 a kind of mist that even remained visible during a period of 20 

 minutes ; after the disappearance of the fireball a tremendous 

 noise like thunder was heard. The meteor was seen by some at 

 a distance of 20 leagues. One fragment, weighing 19 lbs. 8 ozs., 

 was secured by the authorities and sent to Madrid ; Dr. Balcells 

 himself was fortunate enough to secure two stones, one weighing 

 690 grammes, of the form of a flattish triangular pyramid, and 

 not entirely covered with black crust ; the other fragment weighed 

 105 grammes ; this was a fragment with three sides, showing no 

 crust, merely fractured surfaces, resembling a greyish -blue sand- 

 stone containing metallic points. Dr. Balcells afterwards saw 

 other fragments and entire stones presenting very similar cha- 

 racteristics. 



The specific gravity was 3*46 according to Dr. Balcells, which 

 is probably too low ; Professor Escosura, Professor of Chemistry 

 in the College of Mines at Madrid, states the specific gravity to 

 be 3*818, and in chemical constitution that it much resembles the 

 Blansko stone analysed by Berzelius. Professor Escosura found 

 100 parts separated by the magnet to contain 



Iron 90-51 



Nickel 5-68 



Insoluble residue . . . 3*12 



99-31 



The non-magnetic portion contained, in 100 parts, respect- 

 vely— 



