Bailey’s Patent Urinal, Fig. 14, page 30, is very suitable. This costs from Rs. 48 for a two-seat to Rs. 222 for a six-seat one. The patent urinal stands inside the compartment and can be taken out and cleaned without difficulty. For disinfecting purposes chlorinated lime is very useful. It should have 33% of free chlorine, and must be used fresh as it rapidly decomposes. Phenyle is also very useful. [Sidenote: Red Hand Marks.] An ingenious way of making Hindus face the right way, when using latrines, is to make the mark of an outspread hand in red on the wall which they should face, as no Hindu will turn his back on this sign. [Sidenote: Model Rules.] A set of model rules for private privies and urinals is given in Appendix A, page 57. [Illustration: “HINDU” PATENT URINAL, WITH CORRUGATED IRON SUPERSTRUCTURE. FIG. 14. ] CHAPTER VI. COLLECTION AND REMOVAL OF NIGHT-SOIL. In mofussil towns in Bengal the night-soil is generally collected from public and private latrines by conservancy carts drawn by bullocks, and varying in capacity from 60 to 200 gallons. These, as a rule, begin work early in the morning so as to avoid causing a nuisance in the thoroughfares, travel at a very low rate of speed, not over 2 miles an hour, and only make one trip a day, in the majority of cases, owing to the distance the trenching grounds are away from the centre of the town. This means that a large proportion of the human excreta remains at least 24 hours in the receptacles of the latrines in the immediate vicinity of densely populated localities. In the temperate climate of England it is accepted as an axiom that sewage should never be more than 24 hours in finding its way to the outfall, as it is, when it has begun to decompose, more dangerous than when fresh and decomposition sets in much more quickly in the semi-tropical climate of Bengal. In many cases the quantity of night-soil collected per head per diem is exceedingly small; the average amount of solid matter evacuated by natives may be taken at 10 ounces, and of urine 30 ounces, whereas returns from several municipalities show a quantity varying from ·047 to ·37 of a gallon removed by the conservancy carts. These quantities are, however, calculated on the entire area of the municipalities, including the suburbs, where, owing to the custom of Indians, the gardens and adjacent fields dispose of a large quantity. In order to obtain reliable results, the densely crowded areas should be divided up into blocks or sections, keeping the figures well separated in the municipal books, the density of population per block calculated and the quantity of night-soil removed registered daily. Many of the Indian bazaars are long narrow ones, situated on a high ridge of ground, in which case it is desirable to have several trenching grounds, one for each block or group of blocks, instead of having one large one situated at a considerable