nr^M. AUHoussEAU. 309 



1908. RosENBUsCH, H. — Microskopische Physiographic der Mineralien 



und Gesteine, ii., 2. 



1910. Elemente der Gesteinslehre, 



1905. Microscopical Pliysiography of the Rock-niakiiig 



Minerals. (Trans, by J. P. Iddings). 

 1913. Walkom, a. B. — "The Geology of the Permo-Carboniferous System 



in the Glendonbrook District, near Singleton, N.S. W." Proc. 



Linn. Soc. N. S. Wales, xxxviii., pp. 146-159. 

 1911. Wearne, R. a., & W. G. WoOLNOU(JH. — " Notes on the Geology of 



West Moreton, Queensland." Journ. Proc. Roy. Soc. N. S. Wales, 



xlv., pp. 137-159. 



(Very little geological literature is obtainable in Perth as yet.) 



EXPLANATION OF PLATE XL. 



Fig.l. — Pyroxene-andesite; Eelah, (103); crossed nicols, showing coarsely 



devitrified plagioclase-groundniass; ( x24). 

 Fig. 2. — Same rock; ordinary light; ( x 24). 

 Fig.3 — Pyroxene-atnphibole-niica andesite ; Martin's Creek, Paterson, 



(108); crossed nicols; showing finely dev'itrided plagioclase-ground- 



mass; ( x 24). 

 Fig.4. — Hypersthene-andesite; Eelah, (113); ordinary light; ( x 24). 

 Fig. 5. — Plagioclase (oligoclase-andesine) with kernel leplaced by chlorite 



in (105); ordinary light; ( x 28). 

 Fig. 6. — Porphyroid tuff; Eelah, (117); ordinary light; ( x 24). 



