2 TiMEHRI. 



single mills are used the expression of juice during a 

 crop rarely exceeds 66 per cent, of the weight of the 

 cane. In the case of double crushing about 72 to 74 

 per cent, of juice is obtained. 



Whether the existing type of mills, at any rate 

 those in general use in British Guiana, is incapable of 

 improvement may possibly be doubtful ; the result of 

 the De Mornay mill seems to shew that the abolition 

 of the trash turner would be attended with decided 

 advantage. 



Up to the present, however, it has not been found 

 possible to extra6l more than 72 to 74 parts of juice 

 from 100 of cane by means of mills. 



It is contended that an extraftion from the cane 

 equivalent to 85 per cent, of juice can be obtained by 

 means of diffusion. 



It may be remarked, however, that in the report on 

 the manufa6\ure of sugar by diffusion at Magnolia 

 estate in Louisiana, during the season 1888-9, ^y G. I. 

 Spencer, the returns show that with canes containing 

 88*9 per cent, of normal juice, the extra6lion amounted 

 to 83'3 per cent. only. In Demerara, taking a crop 

 through, canes probably do not contain more than 87 

 per cent, of normal juice ; and, assuming the extra6lion 

 by diffusion to be proportionate to the quantity of juice 

 contained in the cane, the extraction would be reduced 

 below 82 per cent. The canes operated upon at 

 Magnolia were plant canes, which accounts for the high 

 percentage of juice. 



The difference, however, between one extra6lion 

 of 72 per cent., and one of 82 per cent., is ob- 

 viously very appreciable. A gain of 10 parts on 



