The Celtic artists drew inspiration from the infinitely subtle mutability of nature.
His cosmology was an assertion not so much of the immutability of the One as rather of the mutability of the Many.
From that time the question of the pleomorphism (mutability of shape) of the bacteria has been hotly discussed; but it is now generally agreed that, while a various forms of bacteria and the and their arrangement.
Rivers began to perceive that it was possible to rise too high for the safety of a subject, and he is now described to us as one who "conceiveth well the mutability and the unstableness of this life."
The chief contributions of Cuvier's great philosophical opponent, Etienne Geoffroy St Hilaire (1772-1844), are to be found in his maintenance with Lamarck of the doctrine of the mutability of species.