332 G. H. KNIBBS. 



of its application is much greater than is usually supposed. By 

 analogy the developments in three-dimensions can be carried into 

 supposititious space of higher dimensions, so long as the nature 

 of such space is definitely representable. The discussion of that 

 further question however, we leave to a future occasion. 



SYMMETRICALLY DISTORTED CRYSTALS FROM 

 WESTERN AUSTRALIA. 



By W. G. Woolnough, b.a., f.g.s. 



[Read before the Royal Society of N. S. Wales, August 7, 1901.] 



The crystals which form the subject of this note were collected 

 by Mr. B. F. Davies, b.Sc, (London), He gives the following 

 description of their mode of occurrence. The crystals of tinstone 

 together with monazite and allanite occur in coarse garnetiferous 

 quartz-felspar veins, intrusive into the garnetiferous gneiss which 

 forms the country rock of the Marble Bar, Cooglegong and Shaw 

 (Withnell's) Tinfields of Pilbarra, North Western Australia. The 

 crystals described, are believed to come from the Cooglegong field 

 though it is possible that some were collected in the neighbouring 

 Shaw (Withnell's) field. The most perfect crystals occur not in 

 the pegmatite vein itself, but in the alluvial of many of the 

 surrounding gullies. They cannot have travelled far since the 

 angles and edges are beautifully sharp and the faces give fairly 

 good reflections. 



When the first of these crystals was exhibited, all who saw it 

 immediately came to the conclusion that it was monoclinic and it 

 was provisionally called wolfram. Mr. Davies stated that he 

 believed it to be tinstone. The amount of material available was 

 too small to permit of thorough chemical investigation, but the 



