:method of ^l^js-ufacture. 511 



boiling begau, the heat was withdrawn, the scum removed, and the 

 sediment allowed to s-ubside, which required about half au hour. 



2. The clear defecated juice was drawn, by means of a stop-cock 

 placed just above the Iwttom of the defecator, into a galvanized iron 

 pan, twelve feet long and 4 feet wide, divided into three compartments, 

 connected by gates in the partitions. The skimming was mainly com- 

 pleted in the first and second compartments, and the semi-syrup from 

 the third was allowed to run in a continuous stream into a Cook pan, 

 in which concentration was conipleted. The syrup was stored in a 

 tin -lined tank until thoroughly cool. 



3. The sediment from the defecator was filtered through plaited baff 

 filters, described on page 289, and filtered juice added to the first evap- 

 orator. 



Rio Grande Sugar Company, Bio Grande, X. J. 



1. Juice is expressed by three-roll mill, and the bagasse is again 

 passed through two additional rolls; the juice from both sets of rolls 

 being received in one tank, and thence pumjied to another. 



2. In this latter there is added to the iuice cream of lime, com- 

 pletely saturated with sulphurous acid, which has been passed into it. 

 Enough of this sulphite of lime is added to render juice slightly turbid. 



3. After settling, the juice is run into the defecating tanks proper, 

 where it is heated to boiling, then skimmed, and passed through the 

 filter press. 



4. The defecated and filtered juice is drawn into the evaporators, 

 where it is reduced by heat from steam coils until scum ceases to rise. 



5. The thin syrup is taken into a horizontal vacuum pan, resembling 

 a tubular boiler; where under about 25 inches of vacimm, it is 

 brought to pan liquor, which is brought into the vacuum pan, and 

 concentrated to melada. This, after storing two to five davs in a warm 

 room, in iron tanks, passes to the mixer, and next to the ceutrifugais. 



Mesults Obtained by Different Methods of Evaporation of Sugar-Cane 

 Juice from Louisiana Canes. 



The following comparative results, obtained by different methods of 

 evaporation, are given by McCulloh, in his report to the government, 

 and are of interest in this connection. 



They were prepared for publication by C. Conrad Johnson, Esq., 

 an experienced sugar-boiler. 



In the following table, comparison is made between the several dif- 

 ferent systems of manufacture, as therein given, both with respect to 

 the amounts of sugars produced, the relative quality or grade of pro- 

 duct, and the total pecuniary value in a relative point of view of each 



