Hence, if the problem be the discovery of a difference, we attribute no great cleverness to the man who only distinguishes those objects, of which the difference is palpable, _e.g._ a pen and a camel: and similarly, it implies no very advanced faculty of comparison, when the objects compared, _e.g._ a beech and an oak, a temple and a church, are near akin. In the case of difference, in short, we like to sec identity, and in the case of identity we like to see difference. Within the range of the empirical sciences however, the one of these two categories is often allowed to put the other out of sight and mind. Thus the scientific problem at one time is to reduce existing differences to identity; on another occasion, with equal one-sidedness, to discover new differences. We see this especially in physical science. There the problem consists, in the first place, in the continual search for new 'elements,' new forces, new genera, and species. Or, in another direction, it seeks to show that all bodies hitherto believed to be simple are compound: and modern physicists and chemists smile at the ancients, who were satisfied with four elements, and these not simple. Secondly, and on the other hand, mere identity is made the chief question. Thus electricity and chemical affinity are regarded as the same, and even the organic processes of digestion and assimilation are looked upon as a mere chemical operation. Modern philosophy has often been nicknamed the Philosophy of Identity. But, as was already remarked (§ 103, note), it is precisely philosophy, and in particular speculative logic, which lays bare the nothingness of the abstract, undifferentiated identity, known to understanding; though it also undoubtedly urges its disciples not to rest at mere diversity, but to ascertain the inner unity of all existence. 119.] Difference implicit is essential difference, the Positive and the Negative: and that is this way. The Positive is the identical self-relation in such a way as not to be the Negative, and the Negative is the different by itself so as not to be the Positive. Thus either has an existence of its own in proportion as it is not the other. The one is made visible in the other, and is only in so far as that other is. Essential difference is therefore Opposition; according to which the different is not confronted by _any_ other but by _its_ other. That is, either of these two (Positive and Negative) is stamped with a characteristic of its own only in its relation to the other: the one is only reflected into itself as it is reflected into the other. And so with the other. Either in this way is the other's _own_ other.