In Russia the black plague did not break out until 1351, after it had already passed through the South and North of Europe. The mortality was extraordinarily great. In Russia, too, the voice of nature was silenced by fear and horror. In the hour of danger, fathers and mothers deserted their children, and children their parents. Of all the estimates of the number of lives lost in Europe, the most probable is that altogether a fourth part of the inhabitants were carried off. It may be assumed, without exaggeration, that Europe lost during the black death twenty-five million inhabitants. That her nations could so quickly recover from so fearful a visitation, and, without retrograding more than they actually did, could so develop their energies in the following century, is a most convincing proof of the indestructibility of human society as a whole. To assume, however, that it did not suffer any essential change internally, because in appearance everything remained as before, is inconsistent with a just view of cause and effect. Many historians seem to have adopted such an opinion; hence, most of them have touched but superficially on the "great mortality" of the fourteenth century. We for our part are convinced that in the history of the world the black death is one of the most important events which have prepared the way for the present state of Europe. He who studies the human mind with attention, and forms a deliberate judgment on the intellectual powers which set people and states in motion, may, perhaps, find some proofs of this assertion in the following observations. At that time the advancement of the hierarchy was, in most countries, extraordinary; for the Church acquired treasures and large properties in land, even to a greater extent than after the crusades; but experience has demonstrated that such a state of things is ruinous to the people, and causes them to retrograde, as was evinced on this occasion. After the cessation of the black plague, a greater fecundity in women was everywhere remarkable; marriages were prolific; and double and treble births were more frequent than at other times. After the "great mortality" the children were said to have got fewer teeth than before; at which contemporaries were mightily shocked, and even later writers have felt surprise. Some writers of authority published their opinions on this subject. Others copied from them, without seeing for themselves, and thus the world believed in the miracle of an imperfection in the human body which had been caused by the black plague. The people gradually consoled themselves after the sufferings which they had undergone; the dead were lamented and forgotten; and in the stirring vicissitudes of existence the world belonged to the living.