XXIV. ABSTRACT OF PROCEEDINGS. 



sphere. The University and Observatory dusts also yielded 

 magnetite and metallic iron containing cobalt and nickel, 

 and the University dust yielded particles of gold, the 

 Observatory dust has yet to be tested. The Moruya, 

 Menindie and Barrier red dusts yielded particles of gold, 

 the others have yet to be examined. Fuller information 

 is given in the paper as to the constituents and chemical 

 composition of the dusts, and anaylses of volcanic and other 

 dusts for comparison. 



Gold in Meteorites. — Prof. Liversidge also exhibited 

 under the microscope particles of a malleable yellow metal, 

 which have all the appearance of gold, obtained from 

 certain Australian and European meteorites (siclerolites). 

 The presence of gold in meteorites bears upon the presence 

 of gold in "meteoric" dusts, and it is also of great interest 

 in connection with the presence of gold upon the earth and 

 in sea-water, inasmuch as meteorites and the dust of 

 meteorites are constantly falling upon the earth, to the 

 extent of probably many million tons a year. Further 

 information upon the question of the presence of gold in 

 meteorites will be given shortly in a subsequent paper. 



4. "A rapid gravimetric method of estimating Lime," by 

 F. B. Guthrie, f.i.c, f.c.s., and O. R. Barker. 



The method consists in mixing previously dried and 

 powdered ammonium nitrate with the calcium oxalate 

 precipitate obtaiued in the usual manner. The oxalate is 

 converted into calcium nitrate which is very readily and 

 completely converted to oxide by a few minutes ignition 

 over a bunsen burner. Prolonged ignition over the blow- 

 pipe is quite unnecessary, and effects no further alteration 

 of the weight of the precipitate. Figures were given show- 

 ing the accuracy of the method. 



Remarks were made by Mr. Hamlet and Prof. Liversidge. 



