Men are sometimes set to work tramping upon sacks filled with rab, in order to separate the syrup from the sugar; again sacks of rab are piled upon a floor with holes for drainage and a well for the syrup that runs off. Weights are often placed upon the bags in order to hasten the process. After the drainage is fairly complete, the rab is dumped into vessels having openings at the bottom and covered at the top by a layer of wet water plants. The water as it passes through the mass of sugar washes the syrup from the crystals and the liquor runs off through the apertures in the bottom. Several days afterward the operation is repeated, and so on until all the syrup has been removed by washing. The resulting sugar is either used in that form, or dried in the sun and worked by human feet in order to lighten its color. Saiyid Muhammad Hadi, assistant director of the Land Records and Agriculture at Allahabad, has worked out an improved method for making rab which is now widely adopted. Under his plan the furnace heat can be readily controlled, so that the danger of burning the juices during boiling is considerably lessened; neither is there so much risk of decomposition (souring). Besides, the cooled rab is purged of its syrup in a centrifugal machine worked by hand instead of by drainage from wet vegetation. At best, however, the production of sugar by the natives of Hindustan is still at a very elementary stage, and in that country new ideas gain ground very slowly, so that it will be some time before modern machinery and equipment are generally in use.