Logical minds, accustomed to be convinced by a chain of somewhat close reasoning, cannot avoid having recourse to this mode of persuasion when addressing crowds, and the inability of their arguments always surprises them. "The usual mathematical consequences based on the syllogism--that is, on associations of identities--are imperative . . ." writes a logician. "This imperativeness would enforce the assent even of an inorganic mass were it capable of following associations of identities." This is doubtless true, but a crowd is no more capable than an inorganic mass of following such associations, nor even of understanding them. If the attempt be made to convince by reasoning primitive minds--savages or children, for instance--the slight value possessed by this method of arguing will be understood. It is not even necessary to descend so low as primitive beings to obtain an insight into the utter powerlessness of reasoning when it has to fight against sentiment. Let us merely call to mind how tenacious, for centuries long, have been religious superstitions in contradiction with the simplest logic. For nearly two thousand years the most luminous geniuses have bowed before their laws, and modern times have to be reached for their veracity to be merely contested. The Middle Ages and the Renaissance possessed many enlightened men, but not a single man who attained by reasoning to an appreciation of the childish side of his superstitions, or who promulgated even a slight doubt as to the misdeeds of the devil or the necessity of burning sorcerers. Should it be regretted that crowds are never guided by reason? We would not venture to affirm it. Without a doubt human reason would not have availed to spur humanity along the path of civilisation with the ardour and hardihood its illusions have done. These illusions, the offspring of those unconscious forces by which we are led, were doubtless necessary. Every race carries in its mental constitution the laws of its destiny, and it is, perhaps, these laws that it obeys with a resistless impulse, even in the case of those of its impulses which apparently are the most unreasoned. It seems at times as if nations were submitted to secret forces analogous to those which compel the acorn to transform itself into an oak or a comet to follow its orbit.