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This atmospheric circulation of the soil, as has been proved by experiment, is of great importance in maintaining its fertility; the successive charges of air supply the needs of the microscopic underground creatures which play a large part in enriching the soil, and the direct effect of the oxygen in promoting decay is likewise considerable.
If equalled at all it is only by atmospheric back-ground. I consider it to be the best ever known, and think it needs but to be tried to afford satisfactory proof that it is so. Although used by few before, since the first edition of this work at least two thirds of the operators have adopted its use; for any one can at once understand the principle and the effect which it produces."
The question of relief valves in turbine installations is an important one, and it seems desirable at this point to draw attention to another necessary relief valve and its function, namely the turbine atmospheric valve.
A single impression, in a very early period of atmospheric existence, perhaps, indirectly, before that period, as was said to have happened in the case of James the First of England, may establish a communication between this centre and the heart which will remain open ever afterwards. How does a footpath across a field establish itself?
But the changes which we are now investigating have no farther relation to those great catastrophes, except in so far as these great operations of the globe have put the solid land in such a situation as to be affected by the atmospheric influences and operations of the surface.
The Eustachian tube admits air freely to the middle ear, providing in this way for an equality of atmospheric pressure on the two sides of the drum membrane. The bridge of bones and the air in the middle ear receive vibrations from the membrana tympani and communicate them to the membrane of the internal ear. *Purposes of the Middle Ear. *—The middle ear serves two important purposes.
A vast atmospheric cloud of vapor surrounded the earth on all sides, preventing the rays of the sun from ever reaching it. Hence the conclusion that these intense heats did not arise from this new source of caloric. Perhaps even the star of day was not quite ready for its brilliant work to illumine a universe.
The plant receives, by means of this water, at the time of its first development, the alkalies, alkaline earths, and phosphates, necessary to its organization. If these elements, which are necessary previous to its assimilation of atmospheric nourishment, be absent, its growth is retarded.
It is therefore important to learn what the telescope will actually accomplish under customary observing conditions. Fortunately we are able to measure the performance of the instrument with certainty. Close beside it on Mount Wilson stands the 60-inch reflector, of similar type, erected in 1908. The two telescopes can thus be rigorously compared under identical atmospheric conditions.
What one sees, another sees, though there has been no communication between the two. I cannot tell you why these phantasms thus partake of the nature of an atmospheric epidemic; the fact remains incontestable.
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