TABLES OF SPECIFIC GRAVITY OF SORGHUM JUICES, ETC. 491 



percentage (see column headed '-Available sugar") when the specific 

 gravitv 1.066 was reached, and this per cent was maintained, and even 

 exceeded, until the specific gravity 1.086 was passed. After this the 

 l^er cent is somewhat variable, because specific gravities above 1.086 

 were not attained until quite late in the season, when the plants had 

 nearly or quite ceased growing ; also, the number of experiments for 

 these higher specific gravities was smaller than for the lower figures. 

 It is safe to say that the profitable working period for sorghum canes 

 begins when the juice attains the specific gravity 1.066, and continues 

 until the specific gravity 1.086 is reached and frequently even longer. 

 During this period, the canes examined furnished on an average 

 61.9 per cent of juice from the stripped stalks. A good mill should 

 furnish not less than 60 per cent on the large scale. Several manu- 

 facturers are willing to contract f >r mills to furnish 65 per cent. 



6 th. On the supposition that a good mill, yielding at least 60 per cent 

 of juice from the stripped stalks, is used, the amount of sugar which 

 should be obtained from 100 pounds of stalks, is found by referring to 

 the figures in the last column corresponding with the specific gravity 

 of the juice obtained. For example, each 100 pounds of stripped 

 stalks, the juice from which has the specific gravity 1.073, should actu- 

 ally furnish 7.7 pounds of cane sugar. 



Specific Gravity Tables of Juices of Sorghum. 



In these tables the average result in percentage of juice ob- 

 tained, the j^ercentage of the sevei*al constituents of the juice, the 

 available sugar calculated as the difference between the sucrose and 

 the sum of the solids not sucrose, the exponent of purity, by which is 

 meant the percentage of sucrose in the total solids of the juices, and 

 the available sugar calculated from this "exponent," as also the num- 

 ber of analyses made, is shown for each degree of specific gravity : 



