2 Wilde, An Egyptian Meteorite. 



A spectroscopic examination of chippings from the meteo- 

 rite was made with the arc light and the direct vision spectro- 

 scope of five prisms with which I discovered the new lines of 

 thallium* and oxygen. The following experimental results for 

 some of the principal lines, in wave lengths, were obtained: — 



Iron. — 4414, 4404, 4382, 4250, 4186,4045. 

 Magnesium. — 5183, 5172, 5167, 5527. 



The spectral lines of magnesium were probably derived 

 from the resolution of olivine into its ultimates, silicon, oxygen 

 and magnesium, as this crystalline mineral is frequently found 

 in meteoric stones. 



* Proc. Roy. Soc, Vol. 53. April 20, 1893. 



