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Their seeming swiftness is very various, and what is highly significant it is notably less when they pursue than when they meet the earth. Yet the "incredible and unaccountable" fact of the existence of these "long radiants," although doubted by Tisserand because of its theoretical refractoriness, must apparently be admitted.
Chandler derives confirmation for his plausible and ingenious theory from a supposed undulation in the line traced out by Algol's small proper motion; but the reality of this disturbance has yet to be established. Meanwhile, M. Tisserand, late Director of the Paris Observatory, preferred to account for Algol's inequalities on the principle later applied by Bélopolsky to those of Castor.
They prefer, if possible, to deal only with calculable causes, and thus to preserve for their "most perfect of sciences" its special prerogative of assured prediction. Roy. Astr. Astr., vol. ii., p. 168; Astr. Nach. See also Tisserand in Ann. Astr., t. i., p. 506, and Astr. Nach., No. 2,594. Month. Not., February, 1884, p. 187. Harzer's attempt to account for it in Astr. Cf. Chandler, Pop.
Halley's, and five other comets are thus related to Neptune; three connect themselves with Uranus, two with Saturn, above a score with Jupiter. Some form of dependence is plainly indicated, and the researches of Tisserand, Callandreau, and Newton of Yale College, leave scarcely a doubt that the "capture-theory" represents the essential truth in the matter.
The proposal to amalgamate agriculture and industries under one Department was adopted largely on account of the opinion expressed by M. Tisserand, late Director-General of Agriculture in France, one of the highest authorities in Europe upon the administration of State aid to agriculture. The creation of a new minister directly responsible to Parliament was considered a necessary provision.
It was ascertained at first by indirect means that the orbit of Neptune's satellite is inclined about 20° to his equator. Mr. Marth having drawn attention to the rapid shifting of its plane of motion, M. Tisserand and Professor Newcomb independently published the conclusion that such shifting necessarily results from Neptune's ellipsoidal shape.
He died suddenly June 25, 1892. Although not an astronomer by profession, he had been singularly successful in pushing forward the cause of the science he loved, while his genial and open nature won for him wide personal regard. He was replaced by M. Tisserand, whose mathematical eminence fitted him to continue the traditions of Delaunay and Leverrier.
The necessity of having recourse to a lengthening day is then less pressing than it seemed some time ago; and the effect, if perceptible in the moon's motion, should, M. Tisserand remarked, be proportionately so in the motions of all the other heavenly bodies.
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