When we look at the mountains, either closely or from a distance, and see their summits above us at one time glittering in the sunshine, at another enveloped in mist, swept round with strong clouds, or blackened with showers, we are disposed to ascribe it all to the atmosphere, as we can easily with the eye see and discern its movements and changes. The mountains, on the other hand, with their glorious shapes lie before our outward senses immoveable. We take them to be dead because they are rigid, and we believe them to be inactive because they are at rest. For a long while, however, I cannot put off the impulse to ascribe, for the most part, to their imperceptible and secret influence the changes which are observable in the atmosphere. For instance, I believe that the mass of the earth generally, and, therefore, also in an especial way its more considerable continents do not exercise a constant and invariable force of attraction, but that this attractive force manifests itself by a certain pulse which, according to intrinsic, necessary, and probably also accidental, external causes, increases or decreases. Though all attempts by other objects to determine this oscillation may be too limited and rude, the atmosphere furnishes a standard both delicate and large enough to test their silent operations. When this attractive force decreases never so little, immediately the decrease in the gravity and the diminished elasticity of the air indicates this effect. The atmosphere is now unable to sustain the moisture which is diffused throughout it either chemically or mechanically; the clouds lower, and the rain falls and passes to the lowlands. When, however, the mountains increase their power of attraction, then the elasticity of the air is again restored, and two important phenomena result. First of all, the mountains collect around their summits vast masses of clouds; hold them fast and firm above themselves like second heads, until, as determined by the contest of electrical forces within them, they pour down as thunder-showers, rain or mist, and then, on all that remains the electricity of the air operates, which is now restored to a capacity of retaining more water, dissolving and elaborating it. I saw quite clearly the dispersion of a cloudy mass of this kind. It was hanging on the very highest peak; the red tints of the setting sun still illuminated it. Slowly and slowly pieces detached themselves from either end. Some fleecy nebulæ were drawn off and carried up still higher, and then disappeared, and in this manner, by degrees, the whole mass vanished, and was strangely spun away before my eyes, like a distaff, by invisible hands.