188 PROCEEDINGS OF THE SCIENTIFIC ASSOCIATION. 
Proximate Analysis of Cane. 
100 parts contain (according to Peligot and Dupuy) — 
Water 
721 
72*0 
Total sugar 
... 18-0 
17*8 
Ash ) 
s 0*4 
Fibre, etc. 3 
9*9 
(9*8 
Composition of Cane Ash. (Calculated from the analyses of 
Stenhouse.) 
100 parts contain — 
Silicic anhydride ... 
46*46 
41*37 
46*48 
50*00 
Sulphuric ,, 
4*65 
10*93 
7*52 
6*40 
Phosphoric „ 
8*23 
4*59 
8*16 
6*56 
Chlorine 
9*11 
'5*55 . 
2*40 
2*38 
Ferric oxide... 
0*00 
0*00 
0*00 
0*00 
Calcium oxide 
8*91 
9*11 
5*78 
5*09 
Magnesium oxide ... 
4*50 
6*92 
15*61 
13*01 
Potassium „ 
15*30 
21*64 
11*93 
13*69 
Sodium ,, 
4*88 
1*13 
2*66 
3*41 
Carbonic anhydride, man- ) 
ganese oxide, etc. ) 
0*00 
0*00 
0*00 
0*00 
Deduct oxygen equal to i 
chlorine. > 
102*04 
2*04 
101*24 
1*24 
100*54 
0*54 
100*64 
0*54 
1 00*00 
100*00 
100*00 
100*00 
The mean quantity of silicic anhydride shown by the above 
analysis is 45*84 per cent.., whereas the mean percentage in 
the ash of the diseased samples is only 36*01— a difference of 
nearly 10 per cent. Professor Liversedge, in a report on the 
sugar-cane disease in Queensland, shows an extraordinary 
deficiency of silicic anhydride in the ash of the diseased plants 
compared with those that were healthy ( Sugar Cane , vol. viii., 
p. 544), He found in. diseased rappoe cane 18*60 per cent, 
of silicic anhydride ; in healthy rappoe 50*47 per cent. And 
