furniture is often covered with dust even more than once in the day, so that writing on it with the finger becomes legible, and the lungs and air-tubes of the inhabitants, with a moist lining to detain the dust, are constantly pumping the same atmosphere. The passengers by a stage-coach in dry weather, when the wind is moving with them so as to keep them enveloped in the cloud of dust raised by the horses’ feet and the wheels of the coach, have their clothes soon saturated to whiteness with the dust, and their lungs of course are charged in a corresponding degree. A gentleman who rode only 20 miles in this way, had afterwards to cough and expectorate for 10 days to clear his chest again.” The imperfection of road cleansing in paved streets at the same time deteriorates the salubrity of the towns, the value of the refuse for production, and the streets themselves. The farmers find that the refuse of the streets, of which horse-dung and other excrementitious substances form so important a part, is valuable in proportion as it is “fresh.” On a proposition to sweep the streets of a town district oftener, it was stated by some farmers that they would, in that case, give more for the refuse. It is with this description of refuse, as stated with respect to the night-soil, in proportion as it is allowed to remain in the streets to dry, it loses the gas which gives it value; and the gas which is lost frequently gives to streets the offensive smell perceptible to strangers who have not been familiarised to it, and makes a deleterious addition to the compounds by which the health of the town population is injured. The complete and rapid cleansing of the roads has also its effects on the draught. It is proved experimentally that, “calling the draught on a broken-stone road 5, that on the same road covered with dust is 8, and that on the same road wet and muddy is 10.”[8] A road should be cleansed “from time to time, so as never to have half an inch of mud upon it. This is particularly necessary to be attended to where the materials are weak, for if the surface is not kept clean, so as to admit of its becoming dry in the intervals between showers of rain, it will be rapidly worn away.” With the even surface obtainable from the use of wood as a pavement, it is stated that the streets which are now kept wet and dirty whilst the process of cleansing is slowly carried on by the hand, may be rapidly and cheaply swept by sweeping-machines drawn by horses. With the advantage of such a system of sewerage as that described by Mr. Roe, the surface refuse, which continues exposed during a whole week, may be removed every morning before the hours of traffic from all the principal thoroughfares. In the main streets of the towns of considerable traffic, a smooth and firm surface for the carriage-way would ensure the advantages of a railroad, in addition to those to the public health from cleanliness. The experience on several portions of