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In the meantime I must deal with friends who tell me that, though the future is fixed as regards inorganic matter, and in some respects with regard to man, yet that there are many ways in which it cannot be considered as fixed. Thus, they say that fire applied to dry shavings, and well fed with oxygen gas, will always produce a blaze, but that a coward brought into contact with a terrifying object will not always result in a man running away. Nevertheless, if there be two cowards perfectly similar in every respect, and if they be subjected in a perfectly similar way to two terrifying agents, which are themselves perfectly similar, there are few who will not expect a perfect similarity in the running away, even though a thousand years intervene between the original combination and its being repeated. The apparently greater regularity in the results of chemical than of human combinations arises from our inability to perceive the subtle differences in human combinations—combinations which are never identically repeated. Fire we know, and shavings we know, but no two men ever were or ever will be exactly alike; and the smallest difference may change the whole conditions of the problem. Our registry of results must be infinite before we could arrive at a full forecast of future combinations; the wonder is that there is as much certainty concerning human action as there is; and assuredly the older we grow the more certain we feel as to what such and such a kind of person will do in given circumstances; but this could never be the case unless human conduct were under the influence of laws, with the working of which we become more and more familiar through experience.