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Being again strongly advised to do so while in Paris, I now began the work, and, in consequence, I was led into a correspondence with Mr. Ivory, who had written on the subject, and also with Mr. Francis Baily, on the density and compression of the earth.
Since the density must be unevenly distributed, either in consequence of the irregularity of the earth's surface, or on account of the condition of the atmosphere in various places, the effect produced would accordingly vary from place to place. Considerable variations in the temperature and pressure of the atmosphere may in this manner be caused at any point of the surface of the earth.
Day after day passed in this manner, although, owing to the density of the rain, the difference between day and night was only perceptible by the periodical changes from absolute blackness to a very faint illumination when the sun was above the horizon.
It consists simply of a closed box with an opening to which the eyes are placed. The opposite end of the box is a piece of board coated with a salt such as platino-barium cyanide. When the X-ray strikes this salt it makes it glow, or fluoresce, and objects held between the X-ray tube and the fluoroscope cast shadows according to the density of the parts which the X-rays penetrate.
Thousands upon thousands of acres of fertile soil are still in their virgin condition. It is capable of supporting a population of almost any density, certainly from eight to ten millions of people might find goodly homes here, and yet the largest estimate at the present time gives only a million and a half of inhabitants.
To arrive at the desired result in the speediest way, let the operation be performed in what is known among bucolic journalists as a "humorous retort." Density and closeness should not be spoken of as equivalent terms.
His idea a minute before had been to wait his opportunity, leap into the wood, and hide while the men went by. Now he saw that his only course was to dash in amongst the forest trees in full sight of his pursuers, and trust to his speed or the density of the way, for his retreat was cut off, and he had no other chance.
He has also, as the result of observations, reduced the probable density of the atmosphere of Mars to 2-1/2 inches of mercury, or only one-twelfth of that of the Earth. Critical Remarks on Mr. Lowell's Paper. The last part of this paper, indicated under pars. 4 and 5, is the most elaborate, occupying eight pages, and it contains much that seems uncertain, if not erroneous.
From certain further observations, which I do not care to speak about at present, I am inclined to assume a pulsating arrangement, or an alternation of layers of greater and lesser density in all organised that is, crystalline matter; for instance, in even such an apparently uniform block as a lump of metallic gold or copper or iron.
From what the astronomers say as to the density of the air on Mars, it is probable that a clear space of at least a mile in height exists between the surface of Mars and the lower limit of the smoke curtain.
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