I am informed, on good authority, that the evacuations of an ox, in 24 hours, will, on the average, exceed those of a horse in weight by about a fifteenth, while, if the ox be disturbed by being driven, the excretions will exceed the horse’s by about a twelfth. As the oxen are not driven in the streets, or detained in the market for so long a period as horses are out at work, it may be fair to compute that their droppings are about the same, individually, as those of the horses.
Hence, as there are 224,000 horned cattle yearly brought to London, we have 224,000 × 45 lbs. = 10,080,000 lbs., or 4500 tons, for the gross quantity of ordure dropped by this number of animals in the course of 24 hours, so that, dividing by 4, as before, we find that there are 1125 tons of ordure annually dropped by the “horned cattle” in the streets of London.
Concerning the sheep, I am told that it may be computed that the ordure of five sheep is about equal in weight to that of two oxen. As regards the other animals it may be said that their “droppings” are insignificant, the pigs and calves being very generally carted to and from the market, as, indeed, are some of the fatter and more valuable sheep and lambs. All these facts being taken into consideration, I am told, by a regular frequenter of Smithfield market, that it will be best to calculate the droppings of each of the 1,617,300 sheep, calves, and pigs yearly coming to the metropolis at about one-fourth of those of the horned cattle; so that multiplying 1,617,300 by 10, instead of 45, we have 16,173,000 lbs., or 7220 tons, for the weight of ordure deposited by the entire number of sheep, calves, and pigs annually brought to the metropolis, and then dividing this by 4, as usual, we find that the droppings of the calves, sheep, and pigs in the streets of London amount to 1805 tons per annum.
Now putting together all the preceding items we obtain the following results:—
Gross Weight of the Horse-Dung and Cattle-Droppings annually deposited in the Streets of London:—
| Tons. | |
| Horse-dung | 36,662 |
| Droppings of horned cattle | 1,125 |
| Droppings of sheep, calves, and pigs | 1,805 |
| 39,592 |
Hence we perceive that the gross weight of animal excretions dropped in the public thoroughfares of the metropolis is about 40,000 tons per annum, or, in round numbers, 770 tons every week-day—say 100 tons a day.
This, I am well aware, is a low estimate, but it appears to me that the facts will not warrant any other conclusion. And yet the Board of Health, who seem to delight in “large” estimates, represent the amount of animal manure deposited in the streets of London at no less than 200,000 tons per annum.
“Between the Quadrant in Regent-street and Oxford-street,” says the first Report on the Supply of Water to the Metropolis, “a distance of a third of a mile, three loads, on the average, of dirt, almost all horse-dung, are removed daily. On an estimate made from the working of the street-sweeping machine, in one quarter of the City of London, which includes lines of considerable traffic, the quantity of dung dropped must be upwards of 60 tons, or about 20,000 tons per annum, and this, on a City district, which comprises about one-twentieth only of the covered area of the metropolis, though within that area there is the greatest proportionate amount of traffic. Though the data are extremely imperfect, it is considered that the horse-dung which falls in the streets of the whole metropolis cannot be less than 200,000 tons a year.”
Hence, although the data are imperfect, the Board of Health do not hesitate to conclude that the gross quantity of horse-dung dropped throughout every part of London—back streets and all—is equal to one-half of that let fall in the greatest London thoroughfares. According to this estimate, all and every of the 24,000 London horses must void, in the course of the six hours that they are at work in the streets, not less than 51 lbs. of excrement, which is at the rate of very nearly 2 cwt. in the course of the day, or voiding only 49 lbs. in the twenty-four hours, they must remain out altogether, and never return to the stable for rest!!!