On Street Odours and Neglect of Ventilation. 35 



Pyrites, Felspar, in small crystals, ^S^em-i-o^a^, Quartz Crystals, 

 Green Fluorspar, and Apatite (?) 



E. J. Dunn, Beechworth. 

 To G. H. F. Ulricli, Esq., Melbourne. 



Catalogue of Specimens. 



1. Chalcedony — shell filled with quartz. 



2. Chalcedony. 



3. Shells with drops of Chalcedony inside. 



4. Do. smooth inside. 



5. Do. coated with quartz crystals. 



6. Do. nearly opaque. 



7. Enhydros with crystals and fluid inside. 

 8. 



9. Scales from the vein in soft granite. 



10. Vein of chalcedony in granite, 



11. Do. in Silurian sandstone. 



12. Do. in hard granite. 



Mr. TJlrich remarked, that enhydros such as those 

 described in Mr. Dunn's paper, which he had just read, were 

 unknown eke where, excepting only in Carolina, U.S. When 

 he was in England, in 1867, he was shown ^imilox polyhedral 

 enhydros of somewhat lighter colour, by Professor Maskelyne, 

 at the British Museum, who said they had occurred, like 

 those at Beechworth, beneath drift. In fact, the' stones from 

 Carolina could only be distinguished from those from 

 Beechworth by the slight difference in colour. 



Art. IX. — On Street Odours and Neglect of Ventilation. 

 By Wm. Walker, Esq. 



[Read 11th April, 1870.] 



The object of this paper was to show that the evils of bad 

 ventilation were too commonly neglected or subordinated to 

 those of bad drainage, and that offensive odours are not 

 nearly so deleterious as air which, from defect of quantity, 

 had to be re-breathed. 



The accuracy of Mr. Walker's vie was to the comparatively 

 greater impoi'tance of ventilation as compared with drainage, 

 was generally contested by the members present, and the 

 discussion was continued at a subsequent meeting. 



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