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Its newspapers publish a table of temperatures, showing the daily contrast between Southern California and the East. This device is effective in the winter-time; but last June, when for five days and nights the temperature was over 110, and several times 114 the Los Angeles space was left empty!

Liquefied nitrogen, when allowed to evaporate under a pressure of sixty millimeters of mercury, gave a temperature of -214 deg. C., only the surface of the liquid gas became opaque from incipient solidification. Under lower pressures the nitrogen solidified, and temperatures as low as -225 deg. C. were recorded by the hydrogen thermometer.

In a word, there would be a chance of something "happening" which, I take it, is why one buys a thermometer and watches it so carefully. Of course, every nice thermometer has a device for registering the maximum and minimum temperatures, which can only be set with a magnet. This gives you an opportunity of using a magnet in ordinary life, an opportunity which occurs all too seldom.

It appears that the use of the self-intensification principle alone is not sufficient with hydrogen as it is with the less volatile gases, including air, for the reason that at all ordinary temperatures hydrogen does not cool in expanding, but actually becomes warmer.

We used the telephones almost daily for taking time, and Simpson used to stand inside the hut at the sidereal clock whilst I took astronomical observations outside in the cold. We also telephoned time to the ice cave in which the pendulums were being swung when determining the force of gravity. Telephones were quite efficient in temperatures of 40 degrees and more below zero.

In order to gain an insight into the amount of contamination which the air undergoes when a geyser or cooking stove is at work, I have determined the composition of the products of combustion, and the unburned gases escaping when a vessel containing water at the ordinary temperatures is heated up to the boiling point by a gas flame, the vessel being placed, in the first case, half an inch above the inner cone of the flame, and in the second, at the extreme outer tip of the flame.

But with a neat little range, heated by electricity and provided with thermometers, with absolutely controllable temperatures and proper heat screens, cooking might very easily be made a pleasant amusement for intelligent invalid ladies.

Only by using the natural zero and measuring continuously from it can we estimate temperatures in relative proportion to the amount of heat received. This is termed the absolute zero, and so that we start reckoning from that point it does not matter whether the scale adopted is the Centigrade or that of Fahrenheit. The Complex Problem of Planetary Temperatures.

There is nothing intrinsically new in this observation; it has often been noticed that metal surfaces at low temperatures give a sensation of burning to the bare touch, but none the less it is an interesting variant of the common fact. Apropos.

But the problem has been made the subject of further investigations which have thrown more light upon it. It was long known that there were various inorganic bodies besides phosphorus which emitted a phosphorescent light in the dark, at least after being exposed to the rays of the sun; but it was not till quite recently that any organic compound was known to phosphoresce at ordinary temperatures.