All the biographical notices of Hutton are unanimous in describing him as one of the most skilful of teachers, and the most amiable of men. His modesty and simplicity were as remarkable as his intellectual gifts. To his friends and pupils he exhibited a warmth of personal affection that attached both to him in a very rare degree. It was also with him a sacred duty to seek out the poor and unbefriended student of science, and promote and otherwise assist him to the best of his power.

HUTTON, James (1726-1797), one of the great founders of geological science, was born in Edinburgh on 3d June 1726. Educated at the high school and university of his native city, he acquired while still a student a passionate love of scientific inquiry. It had been decided that he should pursue a professional career, and he was accordingly apprenticed to a lawyer. But as instead of copying law papers he was sometimes found amusing his fellow-clerks with chemical experiments, his employer with much sagacity advised that a more congenial profession thin the law should be chosen for him. The young apprentice, released from his engagement, chose medicine as the pursuit nearest akin to his favourite study of chemistry. He studied for three years at Edinburgh, and completed his medical education by an attendance of nearly two years at the medical classes in Paris, returning by the Low Countries, and taking his degree of doctor of medicine at Leyden in 1749. At the end of that year he came back to England, only to find, however, that though he had qualified himself to practise as a medical man there seemed hardly any opening for him. In the summer of the ensuing year he definitively abandoned the idea of following out the medical profession, and, having inherited a small property in Berwickshire from his father, resolved to devote himself to agriculture. With the zeal and thoroughness characteristic of his disposition, he then went to Norfolk to learn the practical work of farming. Thereafter he extended his experience by a tour in Holland, Belgium, and the north of France. During these years he began to study the surface of the earth, looking into every pit, ditch, or river-bed that he saw, and gradually shaping in his mind the problem to which he afterwards devoted his energies. In the summer of 1754 he established himself on his own farm in Berwickshire, where he resided for fourteen years, and where he introduced the most improved forms of husbandry. As the farm was brought into excellent order, and as its management, becoming more easy, grew less interesting, he was finally induced to let it, and establish himself for the rest of his life in Edinburgh. This took place about the year 1768.

From this period until his death in 1797 he lived unmarried with his three sisters. Surrounded by congenial literary and scientific friends, he devoted himself to those researches which have had so important an influence upon the progress of science. At that time geology in any proper sense of the term did not exist. Mineralogy, however, had made considerable progress. Hutton’s taste for chemistry naturally led him into mineralogy. But he had conceived larger ideas than were entertained by the mineralogists of his day. He desired to trace back the origin of the various minerals and rocks, ani thus to arrive at some clear understanding of the history of the earth. For many years he continued to ponder over the subject, making during that time many excursions to different parts of the country to obtain materials for his researches, or to test the hypotheses he had been led to form. At last, in the spring of the year 1785, he communicated his views to the recently established Royal Society of Edinburgh in a paper entitled Theory of the Earth, or an Investigation of the Laws Observable in the Composition, Dissolution, and Restoration of Land upon the Globe. In this remarkable work the doctrine is expounded that geology is not cosmogony, but must confine itself to the study of the materials of the earth; that everywhere evidence may be seen that the present rocks of the earth’s surface have been formed out of the waste of older rocks; that these materials having been laid down under the sea were there consolidated under great pressure, and were subsequently disrupted and upheaved by the expansive power of subterranean heat; that during these convulsions veins and misses of molten rock were injected into the rents of the dislocated strata; that every portion of the upraised land, as soon as exposed to the atmosphere, is subject to decay; and that this decay must tend to advance until the whole of the land has been worn away and laid down on the sea-floor, whence future upheavals will once more raise the consolidated sediments into new land. In some of these broad and bold generalizations Hutton was anticipated by the Italian geologists; but to him belongs the credit of having first perceived their mutual relations, an 1 combined them in a luminous coherent theory everywhere based upon observation.

It was not merely the ground beneath us to which Hutton directed his attention. He had long studied the changes of the atmosphere. The same volume in which his Theory of the Earth appeared contained also a Theory of Rain, which was read to the Royal Society of Edinburgh in February 1784. He contended that the amount of moisture which the air can retain in solution increases with augmentation of temperature, and therefore that on the mixture of two masses of air of different temperatures a portion of the moisture must be condensed and appear in visible form. He investigated the data available in his time regarding rainfall and climate in different regions of the globe, and came to the conclusion that the rainfall is everywhere regulated by the humidity of the air on the one hand, and the causes which promote mixtures of different aeri ιl currents in the higher atmosphere on the other.

The vigour and versatility of his genius may be understood from the variety of works which, during his thirty years’ residence in Edinburgh, he gave to the world. In the year 1792 he published a quarto volume entitled Dissertations on different Subjects in Natural Philosophy, in which he discussed the nature of matter, fluidity, cohesion, light, heat, and electricity. Some of these subjects were further illustrated by him in papers read before the Royal Society of Edinburgh. He did not restrain himself within the domain of physics, but boldly marched into that of metaphysics, publishing three quarto volumes with the title An Investigation of the Principles of Knowledge, and of the Progress of Reason—from Sense to Science and Philosophy. In this work he develops the idea that the external world, as conceived by us, is the creation of our own minds influenced by impressions from without, that there is no resemblance between our picture of the outer world and the reality, yet that the impressions produced upon our minds, being constant and consistent, become as much realities tn us as if they precisely resembled things actually existing, and therefore that our moral conduct must remain the same as if our ideas perfectly corresponded to the causes producing them. His closing years were devoted to the extension and republication of his Theory of the Earth, of which two volumes octavo appeared in 1795. A third volume, necessary to complete the work, was left by him in manuscript, and is referred to by his biographer Playfair, but seems to have disappeared. No sooner had this task been performed than he set to work to collect and systematize his numerous writings on husbandry, which he proposed to publish under the title of Elements of Agriculture. He had nearly completed this labour when an incurable disease brought his active career to a close on 26th March 1797.

It is by his Theory of the Earth that Hutton will be remembered with reverence while geology continues to be cultivated. The author’s style, however, being somewhat heavy and obscure, the book did not attract during his lifetime so much attention as it deserved. Happily for science Hutton numbered among his friends John Playfair, professor of mathematics in the university of Edinburgh, whose enthusiasm for the spread of Hutton’s doctrine was combined, with a rare gift of graceful and luminous exposition. Five years after Hutton’s death he published a volume, BBustratioηs of the Huttonian Theory of the Earth, in which he gave an admirable summary of that theory, with numerous additional illustrations and arguments. This work is justly regarded as one of the classical contributions to geological literature. To its influence niuch of the sound progress of British geology must be ascribed. In the year 1805 a biographical account of Hutton, written by Playfair, was published in vol. v. of the Transactions of the Royal Society of Edinburgh.