The first naturalist to give a broad and concrete expression to the evolutionist doctrine of descent was Buffon (1707-1788), but it is interesting to recall the fact that his contemporary Linnæus (1707-1778), protagonist of the counter-doctrine of the fixity of species, went the length of admitting (in 1762) that new species might arise by inter-crossing. Buffon's position among the pioneers of the evolution-doctrine is weakened by his habit of vacillating between his own conclusions and the orthodoxy of the Sorbonne, but there is no doubt that he had firm grasp of the general idea of l'enchaînment des êtres." -An excerpt