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If we imagine the length of the period to be expressed in terms of days and fractions of a day, that is to say, in terms of the rotations of the earth around its axis, then the difficulty encountered is, that the moon now requires for each of its revolutions around the earth rather a smaller number of rotations of the earth around its axis than used formerly to be the case.
Most men gamble with her, and gain all, and lose all, as her wheel rolls. But do thou leave as unlawful these winnings, and deal with Cause and Effect, the chancellors of God. In the Will work and acquire, and thou hast chained the wheel of Chance, and shalt sit hereafter out of fear from her rotations.
Cuvier's contention that all the larger vertebrates of the existing age are known to naturalists was borne out by recent explorations, and there seemed no refuge from the conclusion that the fossil records tell of populations actually extinct. But if this were admitted, then Smith's view that there have been successive rotations of population could no longer be denied.
We should still have his researches on the Liquefaction of Gases; on Frictional Electricity; on the Electricity of the Gymnotus; on the source of Power in the Hydro-electric machine, the last two investigations being untouched in the foregoing memoir; on Electro-magnetic Rotations; on Regelation; all his more purely Chemical Researches, including his discovery of Benzol.
Total: seventeen, out of forty-nine. I resolved upon a fourth experiment, on the 14th of May. The weather is glorious, with a light northerly breeze. I take twenty Mason-bees, marked in pink, at eight o'clock in the morning. Rotations at the start, after a preliminary backing in a direction opposite to that which I intend to take; two rotations on the road; a fourth on arriving.
Nor could the rotation of the planets around the sun afford a case which could be cited. For even Mercury, the nearest of all the planets to the sun of which the existence is certainly known, and therefore the most rapid in its revolution, requires eighty-eight days to get round once; and in the mean time the sun has had time to accomplish between three and four rotations.
It was a gift and a glory that well rewarded the science and genius of Newton and Herschel, of Adams and Le Verrier, that they could ladder these mighty perpendicular distances and climb the rounds to such heights and sweeps of observation, and count, measure, and name orbs and orbits before unknown, and chart the paths of their rotations and weigh them, as in scales, while in motion.
I say, then, that the Heaven of the Sun revolves from West to East, not directly against the diurnal movement, that is, of the day and night, but obliquely against that, so that its mid-circle, which is equally between its Poles, in which is the body of the Sun, cuts into two opposite parts the circle of the two first Poles, in the beginning of Aries and in the beginning of Libra; and it is divided by two arcs from it, one towards the North and one towards the South; the points of these two said arcs are equi-distant from the first circle in every part by twenty-three degrees and one point more, and the one point is the tropic of Cancer, and the other is the tropic of Capricorn; therefore it must be that Maria in the sign of Aries can see, when the Sun sinks below the mid-circle of the first Poles, this Sun to revolve round the Earth below, or rather the sea, like a millstone, of which only one half of its body appears, and can see this come rising up after the manner of the screw of a vine-press, so much so that it completes ninety-one rotations, or a little more.
The reason the growing of potatoes gets no place in any of the rotations of this period seems to be, that their culture was chiefly confined to the poor Celtic population in the mountainous and neglected districts; or, as the author whose pamphlet has a short introduction from Swift says, "to the Popish parts of the kingdom."
The causes which have brought about such gradual exterminations, and in the long lapse of ages have resulted in rotations of population, are the same natural causes that are still in operation. Species have died out in the past as they are dying out in the present, under influence of changed surroundings, such as altered climate, or the migration into their territory of more masterful species.
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