While it is advisable to erect a factory running east and west, the drying-houses should run north and south. In this position the maximum wall area will be exposed to the sun during the day, and it will be possible to manipulate the windows of the drying-rooms so that those along one side are open, and it will never be necessary to close all the windows at any time of the day. Thus the windows facing east will be closed, and those facing west will be open until after midday; then _vice versa_. With such an arrangement a more uniform temperature may be obtained than by any other arrangement of the buildings. If the building ran east and west, the windows on the north side could remain open all day, while those facing south would have to remain closed practically all day. The south side of the house would be heated by the sun, while the north side would remain cool, and the rates of drying would be correspondingly unequal. The total wall area heated by the sun at any time of the day would be less in this position than if the house ran north and south. Similarly, to obtain the best drying effect during the daytime in a smoke-house the building should run north and south. By this means the temperature will be maintained to the maximum possible by sun heat, and the rate of drying will correspond. _References to Sketch Plan._ Drying-house No. 2 should be of two storeys, and unless a separate sorting and packing room is to be built, No. 1 should also have two floors (see previous notes on packing-rooms). In the factory-- _V_ shows the position of the verandah, which may be quite open and only divided from the inner room by _S_, a wall composed of very strong expanded metal, which allows light and air to enter the factory. _T,T_ are the glazed tile tanks for the reception of latex, scrap rubbers, and bark-shavings. _M_ shows the position of the machines on the south side of the factory, with the direction of extensions, and _E,E_ the compartments in which the engines are bedded. In these positions it is possible to obtain direct drive to the machines. _D,D_ are large double swing or sliding doors (the latter for preference always). These, while suiting transport of rubber, provide also for a free draught of air. If possible the scrap-washing machine should be placed outside the wall of the factory, and tanks for the reception of scrap rubbers may then be situated in convenient proximity.