well observed, that the lesson to be derived from him(551) is, that the mechanical view of the world is essentially atheistic; that whosoever will admit no means of discovering God but common logic, cannot find him. Diderot’s unbelief may be considered to embody that which resulted from the abuse at once of erudition, physical science, and the sensational theory in metaphysics. Among the band of friends who from connexion with the Encyclopædia acquired the name of Encyclopædists, was also Helvetius.(552) He was the moralist of the sensational philosophy, one of those who applied the philosophy of Condillac to morals. Each man’s tastes are so far affected by circumstances, that it is possible that Helvetius’s exclusive association with the selfish circles of the French society, which never lived for the good of others, together with the perception of the hollowness of the respect which persons paid him for his wealth and influence, led him to regard self-love as the sole motive of conduct. His philosophy is expressed in two works;(553) the one on the spirit, the other on man: the former a theoretical view of human nature, the latter a practical view of education and society. His primary position is, that man owes all his superiority over animals to the superior organization of his body. Starting from this point, he argues that all minds are originally equal, and owe their variation to circumstances;(554) that all their faculties and emotions are derivable from sensation; that pleasure is the only good, and self-interest the true ground of morals and the framework of individual and political right.(555) If in Diderot we have met with atheism, and in Helvetius with the selfish theory of morals; in the author of “the System of Nature” we meet with utter materialism, and the two former evils as corollaries from it. This work, which was published about 1774, though bearing a different author’s name on the title, was probably the work of D’Holbach,(556) aided by Diderot and Helvetius, and other members of the society which met at D’Holbach’s house. It is a work of unquestionable talent and eloquence, in which materialism, fatalism, and atheism, combine to form a view of human nature which even Voltaire is said to have denounced.