In order to get the maximum quantity of work from the Dryer, the trays must be spread with rolled leaf twice as thick as that used when Tea is dried over charcoal, where there is no forced current of air, and after the Tea has been _half-dried_, then the Tea on _two_ trays should be spread on _one_ tray, and the drying finished. In the Dryers now in course of construction, the trays have been made one-half deeper, so that the half-dried Tea on _three_ trays should be finished in _one_ tray. The out-turn of the machine is greatly diminished when the foregoing method is not observed; and owing to its non-observance, many of the Dryers in use have never been worked to their greatest capacity. The Dryer should be lined outside with one thickness of bricks--they are the cheapest and best non-conductors of heat--inferior or badly-burned bricks may be used. Both ends of the Dryer should be lined, and both sides and elbows as high as the trays. The top may either have a lining of bricks, or four inches thick of sand or clay. When the Dryer is lined round with bricks, it not only greatly reduces the consumption of fuel, but by preventing the radiation of heat, it enables the men to increase the out-turn of pucka Tea. The Dryer is extremely simple and compact--the No. 2 size occupies a space of about 7 feet long and 3 feet wide. The fan of this Dryer requires about half a horse-power to drive it. The fan should be driven at a speed of 500 revolutions per minute. The pulley on the fan spindle is 7-1/2 inches diameter and 4 inches wide. Owing to the satisfaction given by these Dryers this season, an exceptionally large number of orders are on hand, and although a number of each size is generally kept in stock, the patentee will be obliged to those requiring Dryers for next season to kindly send in their orders early. No. 1 Dryer, capable of drying one maund of pucka Tea per hour, £150; No. 2 Dryer, capable of drying two maunds of pucka Tea per hour, £220; No. 3 Dryer, capable of drying three maunds of pucka Tea per hour, £300. These prices are f.o.b. in London. London Agents--Messrs. Geo. Williamson and Co., 7, East India Avenue; Calcutta Agents--Messrs. Williamson, Magor and Co., 4, Mangoe Lane. The best of the three sizes is No. 3. I have quite lately sent out two of them, one for the Phoolbarry, one for the Leesh Company’s Gardens, both in the Western Dooars. I think the prices are much too high, and might with advantage (to both inventor and planters) be reduced; but as to the excellence of the machine there can, I think, be no doubt. My opinion is shared by many. I have before me many testimonials as to its excellence. Space forbids me inserting them here, but Mr. Kinmond or his agents will send them on application.