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Updated: June 9, 2025
When the eye sees black, the heart sees trouble. In an eclipse in the night, in the sooty opacity, there is anxiety even for the stoutest of hearts. No one walks alone in the forest at night without trembling. Shadows and trees two formidable densities. A chimerical reality appears in the indistinct depths. The inconceivable is outlined a few paces distant from you with a spectral clearness.
Hence it follows that the spheres, whether they are of uniform density, or consist of concentric layers of varying densities, will act upon each other in the same manner as if their force resided in their centres alone.
The first successful modification of the action of the rays so that the varying densities of bodily organs will enable them to be photographed, will bring all such morbid growths as tumors and cancers into the photographic field, to say nothing of vital organs which may be abnormally developed or degenerate.
It is evidently important that the deposited material should be so firmly adherent that it can be washed, dried, and weighed without loss in handling. In prescribing analytical conditions it is customary to state the current strength in "normal densities" expressed in amperes per 100 sq. cm. of electrode surface, as, for example, "N.D = 2 amps."
By the hypothesis, equality of temperature between two different gases or two portions of the same gas at different densities means equality of kinetic energies in the same number of molecules of the two. From our observations proving the temperature to be higher, it therefore follows that the potential energy is smaller in the condensed crowd.
'In vivid language, says Professor Huxley, 'he describes the great world-maelstrom widening the margin of its prodigious eddy in the slow progress of millions of ages, gradually reclaiming more and more of the molecular waste, and converting chaos into cosmos. Then, fixing his attention more particularly on our own system, he accounts for the relation between the masses and densities of the planets and their distances from the sun, for the eccentricity of their orbits, for their rotation, for their satellites, for the general agreement in the direction of rotation among the celestial bodies, for Saturn's ring, and for the zodiacal light.
He was off in a moment, galloping at frantic speed along the snowy trail scarcely traceable in the sad light of the gray day; taking short cuts through the densities of the laurel; torn by jagged rocks and tangles of thorny growths and broken branches of great trees; plunging now and again into deep drifts above concealed icy chasms, and rescuing with inexpressible difficulty the floundering, struggling horse; reaching again the open sheeted roadway, bruised, bleeding, exhausted, yet furiously plunging forward, rousing the sparsely settled country-side with imperative insistence for help in this matter of life or death!
For the most part, the mirage of the desert is a baseless illusion, depending on the bending of light-rays by air strata of differing densities.
In the last case the simple limiting characters arrived at will be expressed as densities, specific gravities, and types of material. Furthermore we need not necessarily converge to an abstraction which involves nature at an instant. We may converge to the physical ingredients of a certain point track throughout the whole minute.
Lake Tahoe, with its seventy miles of coast line also affords ready access throughout the winter, by means of motor boat, snow-shoes and explorer's camp, to forests of various types and densities where snow measurements of the highest importance have been made. Delicate instruments of measurement and weight, etc., have been invented by Dr.
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