The question has also been raised whether the action of gravitation is absolutely instantaneous.
The question whether this cause modifies gravitation admits of an easy test from observation.
The meteors, whatever their dimensions, must have motions around the sun in obedience to the law of gravitation in the same manner as planets and comets - that is, in conic sections of which the sun is always at one focus.
The Karawanken railway, a direct connexion with Bohemia and the northern industrial provinces of Austria, is calculated to counteract the gravitation of traffic towards the German ports; while the Tauern railway constitutes the shortest route to the interior of Austria and to the south of Germany.
A good deal of this is transported by gravitation from Baku to Batum on the Black Sea by means of a pipe laid overland.