Sir William Thiselton-Dyer, curator of Kew Gardens, has been studying smoke deposits on vegetation, and, according to his calculations, no less than six tons of solid matter, consisting of soot and tarry hydrocarbons, are deposited every week on every quarter of a square mile in and about London.

This is equivalent to twenty-four tons per week to the square mile, or 1248 tons per year to the square mile.

From the cornice below the dome of St.Paul's Cathedral was recently taken a solid deposit of crystallised sulphate of lime.

This deposit had been formed by the action of the sulphuric acid in the atmosphere upon the carbonate of lime in the stone.

And this sulphuric acid in the atmosphere is constantly being breathed by the London workmen through all the days and nights of their lives.
It is incontrovertible that the children grow up into rotten adults, without virility or stamina, a weak-kneed, narrow-chested, listless breed, that crumples up and goes down in the brute struggle for life with the invading hordes from the country.