AVERAGE RESULTS OF ANALYSES OF SORGHUM, ETC. 217 



sugar 1.26 per cent; or, by the other method, 3.51 — (4.50-1-1.78)= 

 —2.77. 



Juice B contains, sucrose, 15.30 per cent; glucose, .87 per cent; 

 solids, 2.95 per cent. The exponent would be 80.02, and the available 

 sugar, 12.24 per ceut; or, by the other method, 15.30 — (.87-f 2.95)^ 

 11.48 per cent. 



It is from the above assumed cases obvious, that the last method of 

 calculation, although giving probably too low a result, is one of gen- 

 eral application, since no one would regard it as possible practically to 

 obtain any sugar from a juice having the composition of the one 

 marked A. 



It will be seen from the tables, that the available sugar begins to 

 show itself quite late in the development of the plant, generally about 

 the seventh or eighth stage, and it is obvious that, previous to this 

 j^eriod, the available sugar exists, as we may say, as a minus quantity; 

 but owing to the practical importance of this matter, its discussion will 

 be again taken up. 



Danger of viixing Immature ivith Mature Cane in WorJcing. 



It is of greatest practical importance, also, to consider the effect of 

 mixing immature with mature canes in the working. If, for example, 

 a ton of sorghum in the tenth stage was mixed with an equal quantity 

 in the third stage, and the mixed juices together boiled to a syrup, it 

 is doubtful whether auy sugar would be obtained, for, as will be seen, 

 the first lot would yield a juice having 4.49 per cent of available sugar, 

 the second lot of juice would have — 3.24 percent, and the mixed juice 

 would, of course, have but .62 per cent available — so small a quantity 

 as to be practically valueless. It is, then, to be remembered, that, for 

 the purpose of sugar making, every unripe cane allowed to go to the 

 mill is not only worthless in itself, but far ivorse than xvorthless, since it 

 causes the loss of sugar otherwise available. 



This fact will more clearly appear, if the necessary calculations are 

 given of the results. Supposing that the mill gives 60 per ceut of the 

 Aveight of stalks in juice : we should then have 1,200 pounds of juice 

 from each ton of stalks, and the former would give 4.49 per cent of 

 sugar, or 53.88 pounds, while the latter would give — 3.24, or minus 

 38.88 pounds, the difference being 15 pounds of sugar from the two 

 tons of stalks, equal to .625 per cent of 2,400 pounds of juice. 



AVe thus see that, by mixing in the immature canes, we really obtain 

 only about one-fourth the sugar which the one ton of good cane would 

 have yielded alone. 



The above facts are practically understood by the sugar ]>lanters of 



