491 



NOTES AND EXHIBITS. 



Rev. J. Milne Curran exhibited — (1) Dick and Swift's Patent 

 Petrological Microscope, in which the rock-slice under examina- 

 tion remains fixed, while the nicols rotate. The polarizer and 

 analyser are connected by toothed wheels, so that they can be 

 turned together either crossed, inclined, or parallel. Lenses are 

 provided to bring interference figures into the eyepieces. The 

 instrument was much admired by the members present, and seems 

 to be a great advance on the Petrological Microscopes of the old 

 type. (2) Photographs to illustrate various points of geological 

 interest in Western and Central New South Wales, one series 

 showing the peculiar effect of river erosion on slate and granite 

 rocks, at the junction of both, on the Macquarie. (3) Photo- 

 graphs showing the peculiar weathering of " Granitoid " rocks 

 near Nymagee, in what is known locally as the " Tombstone 

 Country." (4) Views of the ridge of Leucite Basalt at Byerock, 

 discovered by Mr. E. David, F.G.S. (5) Micro-photographs of 

 the Leucite Basalt, showing the radial inclusions characteristic of 

 Leucite. (6) Micro-photographs of Basalts from Bathurst and 

 Orange ; the Bathurst rock is micro-porphyritic, with crystals of 

 augite, olivine, and felspar ; the Orange rock a mass of knitted 

 felspar crystals with granules of augite and some glassy matter. 

 (7) Photographs to show hills of Leucite Basalt at El Capitan, 

 Cobar. (8) Views showing aboriginal carvings around grave- 

 mounds in the Dubbo district. (9) Various stone implements 

 from the western districts, amongst which was a stone hatchet 

 made from rock-crystal, or smoky quartz. (10) Skull of an 

 aboriginal of the Bogan River Tribe. 



Mr. David exhibited hand specimens, rock sections, and photo- 

 graphs in illustration of his paper. 



Mr. Froggatt showed the saw-flies described by him, with 

 drawings. 



