Here again, apart from this theory, there is no obvious reason why the composition of different substances should be related in so simple a way.
Some of them were baptized; the territory which was afterwards known as the duchy of Normandy was ceded to them; but the story of the marriage of their chief Rollo with a sister of the king, related by the chronicler Dudo of Saint Quentin, is very doubtful.
Related to the tetrahedron are two spheres which have received much attention.
By using urea, guanidine, thiourea and related compounds instead of amidines, one obtains the uracils.
And Berg related all that he remembered of the various tales he had heard those days.