The screens are discriminating. The bulk of the fibre passes through a one-hundredth-of-an-inch aperture, and is good for paper. Then the residue runs on a screen having apertures of about a sixtieth of an inch; and while that which penetrates the interstices is available for fine cardboard, that which remains above is suitable for coarse cardboard. Now the several streams of porridge are pumped upstairs to wet-presses that contain revolving cylinders. You next see the stuff clinging to a hurrying felt band that transfers it to wooden rollers. When several thicknesses have wound round a roller, they are cut with a pointed stick, removed, and folded; and there you have your mechanical ground pulp, which is nothing but washed wood fibre loosely matted by water. That mechanical ground pulp constitutes about three-fourths, in bulk, of paper used by the daily and weekly Press. I was conducted to the range of buildings where J. R. Booth makes the constituent which, with certain small accessories, completes the substance of our news-sheets. Again logs are the raw material. But this time they are not ground. They are first despoiled of their bark by one piece of mechanism; then by another piece of mechanism they are cut into chips. It seems ungracious to criticise a machine; but I observed that the “chipper” is apt to be a little remiss. Some of the chips it turns out are rather larger than J. R. Booth requires them to be. So all are subjected to a screening test, those of excessive size being dealt with in an auxiliary apparatus called a “re-chipper.” The little nuggets of wood are now sent upstairs in a carrier, and shot into big bins, each of which holds nearly two hundred tons. Thence they pass through funnels into great steel digesters, in which they are packed down close with long iron rods. The digesters have an acid-proof lining of bricks and cement; and, to be informed of the reason for this, I was taken downstairs again. We visited a part of the premises which, by reason of certain fumes, suggested “Paradise Lost.” I am not a chemist, and I cannot describe what the agents of J. R. Booth were doing with their immense supplies of lime and sulphur. It must suffice to say that they produced sulphurous acid and a horrid smell. The former is conveyed to the upper story, and pumped into the digesters, previously packed with chips. “Digester” is the technical and literal description, for the acid-saturated wood is now cooked with steam for ten or twelve hours, at the end of which time it is reduced to white fluff. After being washed in cold water it is called sulphite, and is ready to be mixed with mechanical ground pulp to form paper, small quantities of china clay, size, soda-ash, resin, and blue and red earth being added as a kind of seasoning.