116 



Kind of cane used. — ^The cane ground in this test was from the same field as 

 that taken for "cane analysis No. 42," district of San Carlos, previously quoted 

 as containing fiber 12.51 per cent, sucrose 18.01 per cent, Avitli an exceedingly 

 pure juice of the composition: Brix, 23.0; sucrose, 21.21; quotient of purity, 

 92.15; reducing sugar, 0.22. The field was not very thickly grown, and the cane 

 itself had been much stunted by exceptionally dry weather, so that the cane 

 stalks averaged only 410 grams in weight. It was estimated by the manager 

 of the plantation that this field would produce about 40 piculs of sugar per hectare 

 (2.5 metric tons). A section comprising 8.663 square meters was measured off, 

 and the cane on it ground, with the following yield: 



Cane actually ground, 18,479 kilos, or 21.3 metric tons per hectare. 



Bagasse produced, 8,091 kilos. 



Analysis of bagasse: Dry substance, 46.38 per cent; sucrose, 11.84 per cent 

 (corresponding to "mill juice"' 56.07 per cent) ; fiber, 33.42 per cent; "mill juice," 

 per 100 fiber, 168. 



Juice extracted, 10,388 kilos, of composition: Brix, 23.13; sucrose, 21.11 per 

 cent; "quotient," 91.26; reducing sugar, 0.60 per cent. 



Sugar made, 2,060 kilo.s, of composition: Sucrose, 85.11 per cent; reducing 

 sugar, 5.24 per cent. 



Skimmings thrown away, 699 kilos, of composition: Sucrose, 28.72 per cent; 

 reducing sugar, 0.89 per cent. 



Without entering into details of the calculation, the percentage yields 

 and losses during the experiment, derived from the above data, may be 

 summarized as follows: 



Summary of mill control No. 1. 



Per cent. 



Sucrose in cane " 17.05 



Fiber in cane 14.63 



Juice extracted, on weight of cane 56.22 



Sucrose extracted : 



In juice, on weight of cane ; 11.87 



In juice, on sucrose in cane 69.60 



Raw sugar pioduced, on weight of cane 11.05 



Average polarization of sugar produced _ '"85.11 



Sucrose produced: 



On weight of cane 9.49 



On sucrose in cane 55.67 



On sucrose extracted in juice 79.98 



^ "Sucrose" in these tests refers to the percentage indicated by direct polariza- 

 tion. True sucrose by Clerget would, of course, be a trifle more. 



'^ In ordinary working, the polarization of the raw sugar produced would have 

 been a few degrees higher. In an endeavor to work up as much of the skimmings 

 as possible in the final boiling, some impurities were introduced in the clarified 

 sirup, which resulted in an inferior grade of sugar from this cocida. The previous 

 boilings had averaged about 87 polarization. In practice, skimmings are filled 

 into alternate tanks and allowed to stand until they settle, which was impossible 

 in a test of onlv 1 dav's duration. 



