it is only in these cases that I can have the process of causes producing effects under my inspection. But since cases can be cited, however few, they suffice to establish the fact that the relation of cause and effect, in its full sense, does exist in some instances in the autic _universe_; whereas it has nowhere any place within the domain of physical science. The relation of cause and effect among other _auta_ cannot from the nature of the case be proved. But from its occurrence in that small part of the _universe_ which we do know, we may fairly assume its occurrence in all parts of that _universe_. Such an assumption is at any rate justifiable by scientific method. We must now pass to another point. The scientific analysis of Nature by the physicist has led to an hypothesis which may be regarded as the utmost simplification of which the shadows cast within the human mind by the sense-compelling autic _universe_ are susceptible. This Dr. Stoney calls the Diacrinomenal Hypothesis; according to which Nature is made up of objects each of which consists of almost inconceivably minute and swift motions. The phenomenal orange is a group of molecular motions; and if I bowl it across the table the visible molar motion is a secondary motion of that group of primary molecular motions which constitutes the phenomenal object as such. And not only is the phenomenal object a group of minute and swift motions, but all the steps between that object and our brain, all that takes place in the air or æther, in our organs of sense and nerves, can also be represented in terms of motion. And finally a change consisting of motions takes place in the brain itself, whereupon we become conscious of thought. That change which would be appreciated as motions by a bystander who could search into our brains while we are thinking, we should experience to be _thought_. Thus we find that in certain cases the _autic existence_ that corresponds with motion, namely in the motions of our own brain molecules, is _thought_. And the most probable hypothesis as to the true relation of phenomenal Nature and the autic _universe_ is that what we have found to be true in some cases is always true, and that in every case it is _thought_ (or rather a change in the causal relation in which thought stands to thought) which is the _antitheton_ of motion; so that the totality of all actual existences, the _universe_, is in fact identical with the totality of existing _thought_. Of course all this _thought_, with the exception of that tiny group that is my _mind_, is as much outside my consciousness as are the thoughts of my fellow-men and of the lower animals.