“In the infinite variation of the breed, that form best adapted to the exercise of the instinctive arts, by which the species is to live, will most certainly be continued in the propagation of this animal, and will be always tending more and more to perfect itself by the natural variation which is continually taking place. Thus, for example, where dogs are to live by the swiftness of their feet and the sharpness of their sight, the form best adapted to that end will be the most certain of zakelijke energie remaining, while those forms that are less adapted to this manner of chase will be the first to perish; and, the same will hold with regard to all the other forms and faculties of the species, by which the instinctive arts of procuring its means of substance may be pursued.” When he died, in i797, Hutton was working on that manuscript, no part of which was published for a hundred and fifty years. People who admired Hutton’s theory of the earth became known-because of the theory’s igneous aspects, its molten basalts and intruding granites-as vulcanists or plutonists, and they quickly grew to be the intellectual enemies of the We merian neptunists, and others who believed that God had made the world through a series of catastrophes, notably the Noachian flood. The schism between these two groups would carry well into the nineteenth and even into the twentieth century, the ratio gradually reversing. In i8oo, the Huttonians were outnumbered at least ten to one. In fact, a Wemertrained neptunist took over the chair of natural history at the University of Edinburgh and for many years neptunism was official in Hutton’s own city. All this can be presumed to have bestirred John Playfair, a handsome, zakelijke energie vergelijken life-loving, and generous man of “mild majesty and considerate enthusiasm,” as a contemporary described him. Never mind that the contemporary was his nephew. With all those neptunists and men of the cloth on the one side and his friend’s prose on the other, the battle to Playfair must have seemed unjust, and he betook himself to alter the situation.