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This ingenious application of electricity would enable us to go on for a long time by creating an artificial light even in the midst of the most inflammable gases. "Now, march!" cried my uncle. Each shouldered his package. Hans drove before him the load of cords and clothes; and, myself walking last, we entered the gallery.

The relations of our sense-organs to the various degrees of matter, to solids, fluids, gases, atmosphere and ether, vary in different individuals to such a wide extent as to create the greatest diversity of normal faculty. The average wool-sorter will outvie an artist in his perception of colour shades. An odour that is distinctly recognizable by one person will not be perceptible to others.

Many men in sag-suits had still no idea that anything had gone wrong. Some appeared, brightly carrying loot. Some hung eagerly around the airlocks of ships on the grid tarmac, waiting their turns to stand in corrosive gases for the decontamination of their suits, when they would burn the outer layers and step, aseptic and happy, into a Wealdian ship again.

Sunk into the floor were numberless tin boxes, a foot square and two feet long, and open at the top end. These were full of clear water; and around each box, salt and other proper stuff was packed; also, the ammonia gases were applied to the water in some way which will always remain a secret to me, because I was not able to understand the process.

This is, in fact, all we have of the kinetic theory of gases up to the present time, and this has done for us, in the hands of Clausius and Maxwell, the great things which constitute our first step toward a molecular theory of matter.

The only way to make a mine at all safe from dangerous gases is to keep it full of fresh, pure air. There is no wind to blow through the chambers and passages, and therefore air has to be forced in. One way is to keep a large fire at the bottom of the air shaft. If you stand on a stepladder, you will feel that the top of the room is much warmer than the floor.

I have purchased more than one "perpetual motion" myself. Many persons will remember Mr. Paine "The Great Shot-at" as he was called, from his story that people were constantly trying to kill him and his water-gas. There have been other water gases too, which were each going to show us how to set the North River on fire, but something or other has always broken down just at the wrong moment.

As the gases that surrounded the earth became consolidated into vegetation, as this stupendous growth decomposed the noxious atmosphere, drawing from it its grosser particles and working them up into solid matter, extracting from it what was fatal to animal life, this earth entered upon another era of its progress. "Animal life made its appearance.

This Pneumatic Institution, for ascertaining how far the different gases, received into the lungs, were favourable, or not, to certain diseases, has often been referred to; but its origin, that I am aware of, has never been stated. It has erroneously been supposed, to have depended for its establishment and support, exclusively on Dr. Beddoes.

With a true explosive, such as gun-cotton, nitro glycerine and its compounds, detonation and conversion of the whole into gas are practically instantaneous, whatever the size of the mass; while, with gunpowder, only the exterior of the grain or lump burns and gives off gas, so that the larger the grain the slower the combustion. The products consist of liquids and gases.