179. The usual method of sifting the damp ore into the vats, by means of a shaking sieve worked by hand, is tedious. The roasted ore might be sifted dry through a rotatory cylinder sieve, by hand or by power, and afterwards moistened as usual; then thrown lightly into the vat, by being shaken off a shovel, and distributed by raking. This method would admit of the use of a fine sieve.