212 SORGHUM. 



ity which most quickly reaches the working stage, and longest con- 

 tinues Avorkable. It will be noticed that, judged by this rule, the 

 first eight varieties are superior to those that follow. It appears, 

 also, that these varieties matured in from 77 to 89 days, and con- 

 tinued workable from 87 to 107 days, or, on an average, over three 

 vionths. It is very important to have sufficient time in whicli to work 

 up the crop. 



2. The average purity of the juice is another very important consid- 

 eration. This is shown by the column headed " average exponent;" 

 by this term is meant the percentage of pure crystallizable sugar in the 

 total solids of the juice. As has already been stated in the discussion 

 of the table of specific gravities, the exponent should not fall below 

 70 for the best results. 



3. The average available sugar in the juice has very much to do with 

 its value. The figures in this column were calculated by multiplying 

 the figures in the column showing " average per cent sucrose in juice" 

 by the corresponding figures for "average exponent." 



4. The pounds of juice per acre has much to do with the amount of 

 sugar that can be obtained. 



As will be seen, the various canes do not differ very materially in the 

 percentage of juice they can furnish ; hence, the pounds of juice per 

 acre depend more directly upon the number and weight of canes which 

 can be raised. By reference to the tables for each variety, it will be 

 seen that several of the varieties standing low in this list (Honduras, 

 Honey Top, etc.), furnish canes much heavier than those standing near 

 the first of the list; hence, if an equal number of such heavy canes 

 could be grown on an acre, the amount of juice must be correspond- 

 ingly greater. 



If, then, the quality of the juice from heavy canes is as good as 

 that from the light, and the season for working is greater, the heavy 

 canes would be preferable, because they would furnish the larger 

 amount of sugar per acre. Unfortunately, this is not the case in this 

 latitude. The first two columns in this table show, that the heavier 

 canes do not attain their full growth and maturity in time to be worked 

 up into sugar. 



It is fully believed that these heavy canes are well adapted to the more 

 southern parts of the United States, and that in those regions they will 

 reach full maturity in time to leave an ample working period. In fact, 

 several examinations of canes sent from South Carolina in 1879 con- 

 firm these statements. 



If it be supposed, for the sake of comparison, that an equal number 

 of canes of each variety can be grown on an acre of laud, the results 



