148 TlMEHRI. 
I present herewith a table of results obtained by 
myself at the Government Laboratory, and particularly 
direct attention to columns 7 and 8 as respectively 
showing the assumed amount of sugar in canes as calcu- 
lated from the quantity of fibre, and the actual percent- 
ages present as determined by careful analysis. 
The analyses, particularly those of the last four 
colony canes, have been made with every precaution 
necessary to insure correct and trustworthy results. A 
description of the methods and precautions adopted 
would be too long to introduce into this paper, 
but it may be mentioned that the sucrose de- 
terminations were obtained with a carefully verified 
Soleil Ventzke-Scheibler polariscope, and have been 
properly corrected for temperature.* The glucose 
estimations were made by Soxhlet's admirable method — 
the copper solution for which was repeatedly analysed in 
order that its exact strength might be known. f 
It will be seen that although several of the canes have 
juice of great richness, and of density even as high as 
12 deg. Bm., not one contains as much as 16 per cent. 
of total sugar. 
These results are offered to the Society as a slight 
contribution towards our exa6l chemical knowledge of 
* According to Mategczek, one degree of the S.V.S. polariscope at 
29 C. (84'2 F.) corresponds to "26132 gram of Sucrose. The "26048 
gram usually taken in the colony, refers only to the standard tempera- 
ture of 17-5° C. 
f Fehling's method as usually practised is useless for exact work, as the 
experimental error varies from 1 to 10 per cent. With Soxhlet's volu- 
metric modification, the experimental error need not exceed o"2 
per cent, of the total glucose and the process is capable of even greater 
precision 
