ABSTRACT OF PROCEEDINGS. XXXV. 



Per cent. 



Volatile matter ... ... ... ... ... = 9*61 



Nitrogen = "084 



Weight per acre, one foot in depth = 3,403,125 lbs. 

 Analysis of Silt from Hawkesbury River Water. 



Per cent. 



Insoluble in hydrochloric acid =89*96 



Soluble in hydrochloric acid — 



Oxide of iron and alumina (Pe a 3 and A1 2 3 ) = 4*77 



Lime (OaO) = 0*49 



Potash (K 2 0) = 0*12 



Phosphoric acid (P 2 5 ) = 0*08 



Volatile matter = 4*68 



Nitrogen = 0105 



Weight per acre, one foot in depth = 3,307,332 lbs. 



Mr. Prentice estimates the average depth of the last 

 flood deposit of the Hunter to be about two inches. This 

 would supply the land with a top dressing of fertilising con- 

 stituents to the following amount per acre : — 



Lime 8,791 lbs. 



Potash 510 „ 



Phosphoric acid 1,020 ,, 



Nitrogen 476 ,, 



The data for estimating the thickness of silt deposited 

 by the Hawkesbury river are less complete than those for 

 the Hunter. On the assumption that the thickness was 

 only -<h of that deposited by the Hunter River, the silt of 

 the Hawkesbury flood would weigh 27,561 lbs. per acre, 

 and would supply per acre : — 



Lime 135 lbs. 



Potash 33 „ 



Phosphoric acid 22 ,, 



Nitrogen 29 ,, 



A discussion was commenced by Mr. J. H. Maiden, Dr. 

 R. Greig Smith, and Prof. F. B. Guthrie, but on the motion 



