Eo vos | 
LXVIII. 
A SPECTROGRAPHIC ANALYSIS OF IRON METEORITES, 
SIDEROLITES, AND METEORIC STONES. By W. N. 
HARTLEY, F.R.S., and HUGH RAMAGH, Assoc. R.C.Sc.L., 
E.I.C. 
(Puates XXII., XXIT., XXIV.) 
_ [Read May 19; Received for Publication, May 21, 1897; 
Published, Frpruary 9, 1898. | 
In a Paper just published in the Transactions of the Chemical 
Society, vol. 51, p. 533, on “ The Wide Dissemination of some of 
the Rarer Elements, and the mode of their association in Common 
Ores and Minerals,’ we have shown that out of 91 iron ores 
belonging to the metallurgical collection in the Royal College of 
Science, 385 contain the extremely rare metal gallium, and most of 
them contain constituents of an unusual character not hitherto 
known or suspected to be contained therem. For instance, 
rubidium appears to be very commonly present, while the mag- 
netites, from whatever part of the world, invariably contain 
gallium, but no indium; the siderites all contain indium, but 
no gallium. We have therefore considered it desirable that 
meteorites should be examined, and acgprdingly a selection of 
specimens was made for the purpos#® They are classified into 
meteoric irons, siderolites, and meteorites, or meteoric stones, and 
on the following pages their composition is shown, with the collec- 
tions from which they were obtained. 
In the paper mentioned, we have given a list of those elements 
capable of being detected by our method of examination. Those 
which are not volatilised in the oxyhydrogen flame are silicon, 
titanium, vanadium, tungsten, platinum, &c., and these have not 
been sought for. 
