9.] But in the second place in point of _form_ the subjective reason desires a further satisfaction than empirical knowledge gives; and this form, is, in the widest sense of the term, Necessity (§ 1). The method of empirical science exhibits two defects. The first is that the Universal or general principle contained in it, the genus, or kind, &c, is, on its own account, indeterminate and vague, and therefore not on its own account connected with the Particulars or the details. Either is external and accidental to the other; and it is the same with the particular facts which are brought into union: each is external and accidental to the others. The second defect is that the beginnings are in every case data and postulates, neither accounted for nor deduced. In both these points the form of necessity fails to get its due. Hence reflection, whenever it sets itself to remedy these defects, becomes speculative thinking, the thinking proper to philosophy. As a species of reflection, therefore, which, though it has a certain community of nature with the reflection already mentioned, is nevertheless different from it, philosophic thought thus possesses, in addition to the common forms, some forms of its own, of which the Notion may be taken as the type. The relation of speculative science to the other sciences may be stated in the following terms. It does not in the least neglect the empirical facts contained in the several sciences, but recognises and adopts them: it appreciates and applies towards its own structure the universal element in these sciences, their laws and classifications: but besides all this, into the categories of science it introduces, and gives currency to, other categories. The difference, looked at in this way, is only a change of categories. Speculative Logic contains all previous Logic and Metaphysics: it preserves the same forms of thought, the same laws and objects,--while at the same time remodelling and expanding them with wider categories. From _notion_ in the speculative sense we should distinguish what is ordinarily called a notion. The phrase, that no notion can ever comprehend the Infinite, a phrase which has been repeated over and over again till it has grown axiomatic, is based upon this narrow estimate of what is meant by notions.