26 Proceedings of the Royal Society of Victoria. 



evidence is not conclusive till they shall have Ijeen traced to 

 their natural sites. He says they have been collected at distant 

 parts of the colony, occurring either loose on the surface or 

 embedded in the " crust limestone." 



Mr. H. Y. L. Brown, in the Catalogue of South Australian 

 Minerals, 1893, states that obsidian "has been found in alluvium 

 and on the surface generally in round, button-shaped pieces all 

 over the province, although most frequent in the stony downs 

 and table-hill country of the far north, where its presence, so far 

 away from any volcanic centre, is most difficult to account for." 



Victor Streich,^ who was geologist to the Elder Exploring 

 Expedition, states " that two specimens of the well-known 

 obsidian bombs, and of the usual shape, were collected, one at 

 Birksgate Range and one near Mount Squires, No clue could, 

 however, be obtained as to the original site, or in explanation of 

 their wide-spread occurrence." In some supplementary notes to 

 this paper on the rock and mineral specimens collected. Professor 

 A. W. Stelzner, in dealing with the obsidian bombs found 

 between Everai'd Range and Eraser Range, says that they ai*e 

 " most decidedly not of cosmic origin, as suggested by you in 

 your private letter to me. At least, so far there are no vitreous 

 masses known to me of meteoric origin. According to their 

 shape, I am inclined to pronounce them as water-worn, and I 

 should think that the obsidian, from which they are derived, 

 will be found yet in situ. I cannot say anything more about 

 them without any knowledge of their occurrence." 



Subsequently Professor Stelzner received other specimens for 

 examination and further information, and as a result he published 

 an elaborate paper'- on the subject. He also wrote a lengthy 

 letter to Victor Sti'eich, who had forwarded the obsidianites to 

 him. Five of these were collected at the McDonnell Ranges 

 and the sixth, a hollow one, was found on Kangaroo Island. 

 The substance of the letter is practically the same as the paper, 

 and therefore need not be specially referred to apart from it. 

 Professor Stelzner, who believes these objects to be genuine 

 volcanic bombs, points out certain resemblances to the Bohemian 



1 Trans, of Royal See. of S. Aust., vol. xvi. (1S93), p 84. 



2 Ueber eigenthllmliche Obsidian-Bomben aus Australieii. Zeitschrift der Deutschen 

 Geologischen Gesellschaft, xlv. Band, 1893, p. 299. 



