There are many, it is true, who imagine that the scientific inquiries which are being made in regard to the great age of the world, the races which existed long anterior to the historic period, and the origin of the human species are founded in a spirit of skepticism and hostility to Christian civilization, or, rather to Christianity as a religion. Doubtless there are many scientists who put no faith in Holy Writ, as much of it has been commonly understood. Others, and those among the most distinguished of men, are no less devout believers in Christianity than they are firm believers in the great age of the world and antiquity of man. The devotees of Christianity have in not a few instances mistaken an ally for an enemy. This was notably the fact, in an example which is here most appropriate, in the case of the modern origin of the science of astronomy. The Christian church, as then existing, pronounced as religious heresy the plain truth that the world moves, and that the sun neither rises nor sets, but is stationary--the sublime centre of a universe of planets and stars, and, perhaps, inhabited worlds, whose movements must be controlled, as the vast system must have been originated, by One of infinite wisdom and power and goodness. In due course of time it was discovered that astronomy did not militate against Christianity, and the church not only ceased putting astronomers in prison, but learned that the acceptance of all truth, come from whatever source it may, is a Christian duty. And many of the most distinguished astronomers have been no less earnest exemplars of the Christian system of religion than any monk who ever wore the pavements of a monastery and left the world no wiser or better than he found it.