Order, then, is nothing but necessity, considered relatively to the series of actions, or the connected chain of causes and effects, that it produces in the universe. What is the motion in our planetary system; but a series of phenomena, operated upon according to necessary laws, that regulate the bodies of which it is composed? In conformity to these laws, the sun occupies the centre; the planets gravitate towards it, and revolve round it, in regulated periods: the satellites of these planets gravitate towards those which are in the centre of their sphere of action, and describe round them their periodical route. One of these planets, the earth which man inhabits, turns on its own axis; and by the various aspects which its revolution obliges it to present to the sun, experiences those regular variations which are called SEASONS. By a sequence of the sun's action upon different parts of this globe, all its productions undergo vicissitudes: plants, animals, men, are in a sort of morbid drowsiness during _Winter_: in _Spring_, these beings re-animate, to come as it were out of a long lethargy. In short, the mode in which the earth receives the sun's beams, has an influence on all its productions; these rays, when darted obliquely, do not act in the same manner as when they fall perpendicularly; their periodical absence, caused by the revolution of this sphere on itself, produces _night_ and _day_. However, in all this, man never witnesses more than necessary effects, flowing from the nature of things, which, whilst that remains the same, can never be opposed with propriety. These effects are owing to gravitation, attraction, centrifugal power, &c.