The feud between these two princes originated probably in a dispute over the succession to the throne; its details, however, are obscure, and the only fact which can be ascertained with any certainty is that Duncan was slain by Macbeth in 1040.
Their dynasty of monarchs can be traced back with tolerable certainty to a period coincident with the reign of Henry IV.
Coulomb, 2 however, by using long and thin steel rods, symmetrically magnetized, and so arranged that disturbing influences became negligibly small, was enabled to deduce from his experiments with reasonable certainty the law that the force of attraction or repulsion between two poles varies inversely as the square of the distance between them.
When they, the immediate successors of Plato, rejected their master's ontology and proposed to themselves as ends mere classificatory sciences which with him had been means, they bartered their hope of philosophic certainty for the tentative and provisional results of scientific experience.
But inferences of this class have hardly attained to sufficient certainty and generality to be set down in the form of rules.
Still unsatisfied, longing always for a certainty that seemed ever just beyond his grasp, he had added vigil to vigil, and penance to penance, until at last, when to the wondering view of others he had become more than a saint, his bodily strength and his indomitable resolution and faith had together suddenly and completely broken down.
But at times he uses language that almost compels one to attribute to him the popular view of conscience as passing its judgments with unerring certainty on individual acts.
The officer points out the folly of such a course, and the certainty that the republic, whose troops had triumphed over those of Prussia and Austria, will speedily disperse the untrained levies of Provence.
The Nuclei of the Lower Plants.It is only in comparatively recent times that it has been possible to determine with any degree of certainty that the minute deeply stainable bodies described more especially by Schmitz (1879) in many Algae and Fungi could be regarded as true nuclei.
St Alban is commemorated in the Roman martyrology on the 22nd of June; but it is impossible to determine with certainty whether he ever existed, as no mention of him occurs till the middle of the 6th century.