xlvi. ABSTRACT OF PROCEEDINGS. 



H a O (1( 



)0°)... 



... 0'41 



MnO 



H a O(100°-h) 



... 1*25 



OaO. 



Si0 2 



... 



... 47*21 



MgO 



Al 2 O s 



... 



... 11*12 



Cr a O 



FeO... 





... 5-11 





Fe 3 O a 



... 



5'50 





Ti0 2 



. . . 



... 0*79 





0*29 



19*73 



8 97 



0*13 



100*51 



One crystal drawing and two gnomonic projections 

 accompany the paper. Some remarks were made by Prof. 

 David. 



THE FOLLOWING PAPERS WERE DISCUSSED: 



1. " The Flood Silt of the Hunter and Hawkesbury Rivers," 

 by Prof. T. W. Edgbworth David, b.a., f.g.s., f.r.s., 

 and Acting- Prof. F. B. Guthrie, f.i.c. f.c.s. 



Remarks were made by Mr. C. A. Siissmilch, Mr. T. F. 

 Furber, on behalf of Mr. E. MacFarlane, Mr. R. T. McKay, 

 Mr. J. H. Maiden and the President. The authors replied. 

 Mr. MacFarlane emphasised the importance of the paper, 

 not only in its scientific aspect but also from the fact that 

 the periodical enrichment of the flooded lands formed a 

 considerable factor in the general question of land settle- 

 ment. He pointed out the relation which these lands bore 

 to the large areas in climatically less favoured parts of the 

 State, and entered into a comparison between the produc- 

 tiveness of the two classes of land, indicating how the 

 richer lands must of necessity be regarded as the sources 

 from which in times of drought food supplies must be drawn 

 and on which the whole question of the habitableness of 

 much of the interior must to some extent rest. He thought 

 so highly of inquiries such as had been conducted by Pro- 

 fessors David and Guthrie, that he would endeavour to 

 cause such observations to be made as would perhaps form 

 the basis of further investigation. 



