Prof. Olmsted also examines the hypothesis of Dr. Herschel, relative to clouds surrounding the sun, and reasons as follows: "I am compelled to think the hypothesis (of Dr. H.) is encumbered with very serious objections. Clouds analogous to those of our atmosphere (and Dr. H., expressly asserts that his lower stratum of clouds are analogous to ours, and reasons respecting the upper stratum according to the same analogy) cannot exist in hot air; they are tenants only of cold regions. How can they be supposed to exist in the immediate vicinity of a fire so intense, that they are even dissipated by it at the distance of ninety-five millions of miles? Much less can they be supposed to be the depositories of such devouring fire, when any thing in the form of clouds floating in our atmosphere, is at once scattered and dissolved by the accession of only a few degrees of heat. Nothing, moreover, can be imagined more unfavorable for radiating heat to such a distance than the light, inconstant matter of which clouds are composed, floating loosely in the solar atmosphere." Prof. Olmsted continues, "If we inquire whether the surface of the Sun is in a state of actual combustion, like burning fuel, or merely in a state of intense ignition, like a stone heated to redness in a furnace, we shall find it most reasonable to conclude that it is in a state of ignition. If the body of the Sun were composed of combustible matter and were actually on fire, the material of the Sun would be continually wasting away, while the products of combustion would fill all the vast surrounding regions, and obscure the light of the Sun. But solid bodies may attain a very intense state of ignition, and glow with the most fervent heat, while none of their material is consumed, and no clouds or fumes rise to obscure their brightness, or to impede their further emission of heat." Hence, for these and other reasons, Prof. Olmsted thinks it more probable that the heat is that of a high state of ignition, rather than produced from combustion. Thus we see that while all Astronomers agree that the Sun is the source of light and heat; that this heat is vastly intense; consuming, and yet never consumed or exhausted, it is a difficult matter to determine the nature and true element composing it. All agree however, that God himself created it and placed it in its proper position, and controls it for His own wise purposes.