I have sometimes wonder'd that the Londoners did not

I have sometimes wonder'd that the Londoners did not, from the effect holes in the bottom of the globe lamps us'd at Vauxhall have in keeping them clean, learn to have such holes in their street lamps. But, these holes being made for another purpose, viz., to communicate flame more suddenly to the wick by a little flax hanging down thro' them, the other use, of letting in air, seems not to have been thought of; and therefore, after the lamps have been lit a few hours, the streets of London are very poorly illuminated.
The mention of these improvements puts me in mind of one I propos'd, when in London, to Dr. Fothergill, who was among the best men I have known, and a great promoter of useful projects. I had observ'd that the streets, when dry, were never swept, and the light dust carried away; but it was suffer'd to accumulate till wet weather reduc'd it to mud, and then, after lying some days so deep on the pavement that there was no crossing but in paths kept clean by poor people with brooms, it was with great labour rak'd together and thrown up into carts open above, the sides of which suffer'd some of the slush at every jolt on the pavement to shake out and fall, sometimes to the annoyance of foot-passengers. The reason given for not sweeping the dusty streets was, that the dust would fly into the windows of shops and houses.
An accidental occurrence had instructed me how much sweeping might be done in a little time. I found at my door in Craven-street, one morning, a poor woman sweeping my pavement with a birch broom; she appeared very pale and feeble, as just come out of a fit of sickness. I ask'd who employ'd her to sweep there; she said, "Nobody, but I am very poor and in distress, and I sweeps before gentlefolkses doors, and hopes they will give me something." I bid her sweep the whole street clean, and I would give her a shilling; this was at nine o'clock; at 12 she came for the shilling. From the slowness I saw at first in her working, I could scarce believe that the work was done so soon, and sent my servant to examine it, who reported that the whole street was swept perfectly clean, and all the dust plac'd in the gutter, which was in the middle; and the next rain wash'd it quite away, so that the pavement and even the kennel were perfectly clean.
I then judg'd that, if that feeble woman could sweep such a street in three hours, a strong, active man might have done it in half the time. And here let me remark the convenience of having but one gutter in such a narrow street, running down its middle, instead of two, one on each side, near the footway; for where all the rain that falls on a street runs from the sides and meets in the middle, it forms there a current strong enough to wash away all the mud it meets with; but when divided into two channels, it is often too weak to cleanse either, and only makes the mud it finds more fluid, so that the wheels of carriages and feet of horses throw and dash it upon the foot-pavement, which is thereby rendered foul and slippery, and sometimes splash it upon those who are walking. My proposal, communicated to the good doctor, was as follows: