Economy of labour is obtained by grouping all factory buildings as closely as possible, but it should be borne in mind that smoke-houses should be regarded as a possible source of danger from fire. This point has a practical bearing upon rates of insurance, and it is essential that the smoke-house should be situated at a minimum of 50 feet from any other building or group of buildings. In this connection, also, it may be noted, as being of further practical interest, that, in the insurance of smoke-houses, preferential rates are given to those having a good type of slow-combustion furnace. CHOOSING A FACTORY SITE.--Sufficient has been written to make it clear that the choice of a site for factory buildings is a matter demanding weighty consideration. Much, of course, depends upon the planted area, and the rate at which it comes into bearing. Under certain circumstances which will be obvious, it is permissible to instal first a group of buildings of a temporary nature only, the future site and permanent buildings to be chosen later when the main portion of the estate comes into bearing. Often, however, one finds that, from lack of forethought, the estate has been committed to considerable expense in the establishment of equipment, which later is proved to be unfavourably situated with regard to the majority of the area in ultimate bearing. In such case, transport of latex is fraught with difficulties and may be expensive. In the instance of an estate which will gradually come into bearing, it is not easy to decide whether a temporary installation shall first be provided, or whether, in anticipation of future demands, a complete equipment shall be erected. So much depends upon the financial aspect of the question, and upon the rate at which areas will come into bearing. As far as is possible, the best policy would be that of a compromise under which the site would suit later requirements, and the factory would be so planned as to be capable of future easy extensions both of buildings and machinery. It is not possible to lay down any definite data as regards requirements based on acreage, or to make comparisons between any two estates of similar acreage. The important factors determining such requirements are: (_a_) Area. (_b_) Shape of the estate. (_c_) Topography of the estate. (_d_) Available supplies of water. Naturally the ideal site for factory buildings would lie in a central position, given other favourable conditions.