200 Proceedings of the Royal Society of Victoria. 



V. — Chemical Composition. 



Three analyses of the Mount Macedon rocks have been pre- 

 pared. The sblvsbergite from the Camel's Hump was analysed 

 by Newbery. By the kind permission of Professor Orme Masson, 

 analyses of the Willimigongong dacite and the trachy-phonolite 

 of the Turritable Waterfall have been made by Mr. R. J. 

 Lewis in the University Laboratory. The analyses are given on 

 page 201. For comparison with them are given analyses of 

 dacites from Dandenong and the Black Spur, and of a grano- 

 diorite, also from Dandenong, for which I am indebted to the 

 Government Metallurgist, Mr. H. C. Jenkins, A.R.S.M. To 

 Dacia Doelter's analysis of the latter is quoted in column No. 13 

 show the differences between the geburite-dacite and the dacite of 

 In comparison with the trachy-phonolite of the waterfall may be 

 quoted vom Bath's analysis of the rock from Scarrupata in 

 Ischia. 



Prior's analysis of a solvsbergite from Abyssinia is given in 

 column No. 11. 



