May, 1902. Meteorite Studies, I — Farrington. 299 



so that the above can practically be regarded as bronzite. It may 

 seriously be questioned, however, whether digestion in hydrochloric 

 acid can be relied upon to wholly separate the chrysolite and bronzite, 

 for with longer digestion some of the bronzite is apt to go into solu- 

 tion, or, with shorter treatment, some of the chrysolite may not be 

 decomposed. Further investigation of this subject should be~made. 

 Taking all the probable ingredient minerals of the rock into con- 

 sideration, the following is perhaps the best estimate that can at 

 present be made as to its probable composition: 



Per Cent 

 Bronzite and Monoclinic Pyroxenes .... 47-05 



Chrysolite 24.74 



Limonite 10.50 



Chromite 8.83 



Troilite 5.24 



Schreibersite 0.23 



Nickel-Iron 3.31 



Oxides of Cobalt and Nickel . . ' . . . . o. 10 



100.00 



Here the limonite is probably of secondary or terrestrial origin 

 and should perhaps be divided up about equally between the nickel- 

 iron and troilite in estimating the pre-terrestrial composition of the 

 rock. The composition as shown above of about one-half bronzite 

 accords well with what one can observe after treating a section with 

 hydrochloric acid so as to dissolve out the chrysolite, for an exten- 

 sive framework made up of bronzite then remains. The high per- 

 centage of chromite indicated by the analysis is also in accordance 

 with observations made with the microscope. 



The resemblance of the meteorite to terrestrial peridotites is, 

 as noted by Weinschenk, very marked, and the constant association 

 both in terrestrial and extra-terrestrial regions of the elements and 

 minerals which compose rocks of this class indicates laws of asso- 

 ciation which are not yet comprehended. 



SUMMARY. 



1. The Long Island meteorite is a single isolated fall and fell as 

 a single stone. 



2. It is the largest single stone meteorite known. 



3. It is traversed by planes resembling joint planes which are' 

 pre-terrestrial in their origin. 



