And then tne tilder — the cotton-the carbon: Because the soil reflects upon objects near to it the heat of the solar rays. It is therefore called carburetted hydrogen, which means hydrogen with carbon. Because, by inducing currents of air to pass over the face, a part of the excessive heat is taken up and carried away. Carbonic acid, where does it Chimney, why does it smoke chiefly exist And yet how sitnple the phenomenon S Matters so volatile as those which produce the Ignis Fatutcs would naturally be driven back by the motion in the air caused by an advancing body; and, on the other hand, a body moving from them would create a current in which the Igl s Fatuus would follow. Is it not a waste offuel to allow this matter to escape?

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Because the quality of coals, and the conditions under which they are burnt, are liable to variation. It proves speedily fatal to animals. Because as they breathe more rapidly, the combustion of the carbon in the blood is increased by the oxygen inhaled, and greater heat is developed.

Saliva, why does saliva enter otpical Smoke, why do fiesh coals nmouth while we are eating The Indc Lmssons do seo eop respon. In venous blood, the average quantity of carbonic acid is about th, that of oxygen about th, and that of nitrogen about th of the volume of the blood.

What is the cause of winds? Why, if a piece of paper be laid with its flat surface upon thefire, will it ” char,” but not ignite?


Why, if you direct a current of air towards the paper. Because it contains a large amount of water, which must be evaporated before combustion can proceed. The instrument will show with sufficient accu.

He sprinkles water on the coal dust to told its particles together by cohesion, until the heat forns it into a cake. Because, in the act of congelation a great deal of heat is given out, and taken up by the air, and thus the severity of the cold is in some degree moderated.

Because flame spreads most rapidly in an upward direction.

Because, by inducing currents of air to pass over the face, a part of the excessive heat is taken up and carried away. The proportions of these elements vary in different kinds of coal. Because it is combined with a larger proportion of carbon, to which it owes its increased luminosity.

The axles of railway carriages frequently become red hot from friction. What is the deference between “burning” and “sulpporting combustion? Why, if we light mouuse piece ofpaper, and lay it owhere the gas is escapingfrom the coals, will it burst into flame? Although it will burn, yielding a feeble bluish light, it will, if pure, extinguish a flame that may be immersed in it.

What substances are the best radiators? Water is therefore a com.

Full text of “Nature”

Wrhen we gaze upon a rose it is not its beauty alone that should impress 1m: But if as opical in the Lessons upon Conduction metal is a better conductor of heat than stone or earthenware, why does not the metal jug conduct away the heat of the water sooner than the earthenware jug? And some of its rays, falling upon a mirror, or any other bright surfa.


Wifhat does oprical example of the motion of the air in our rooms explain? It is, as it might all be burnt up by better management. The flame is then applied to paper or wood, and the heat of the flame is sufficient to drive out hydrogen gas, which unites with the oxygen of the air, and burns, imparting greater heat to the carbon of the coals, which assumes the form of carhonic acid gas by union with oxygen, and in a little while all the conditions of combustion are established.

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What becomes of the revmainina two-thirds of the solar heat? Optiacl carbonic acid gas is the heaviest of all the gases. Because cold air rushes towards the flame in every direction, and. It is Therefore advisable to observe precautions in the use of gas.

Every flower, every ray of light, every drop of dew, each flake of snow, the curling smoke, the lowering cloud, the bright sun, the pale moon, the twinkling stars, speak to us in eloquent language of the great Hand that made them.

Because, also, the vital principle life exercises a mysterious influ-i ence in the preservation of living bodies from physical influences.