intellect, an intensifying of all the _emotions_ appears, and indeed the possibility of the _passions_, which, properly speaking, are unknown to the brute. For the vehemence of the will keeps pace with the advance of intelligence, because this advance really always springs from the increased needs and pressing demands of the will: besides this, however, the two reciprocally support each other. Thus the vehemence of the character corresponds to the greater energy of the beating of the heart and the circulation of the blood, which physically heighten the activity of the brain. On the other hand, the clearness of the intelligence intensifies the emotions, which are called forth by the outward circumstances, by means of the more vivid apprehension of the latter. Hence, for example, young calves quietly allow themselves to be packed in a cart and carried off; but young lions, if they are only separated from their mother, remain permanently restless, and roar unceasingly from morning to night; children in such a position would cry and vex themselves almost to death. The vivaciousness and impetuosity of the ape is in exact proportion to its greatly developed intellect. It depends just on this reciprocal relationship that man is, in general, capable of far greater sorrows than the brute, but also of greater joy in satisfied and pleasing emotions. In the same way his higher intelligence makes him more sensible to _ennui_ than the brute; but it also becomes, if he is individually very complete, an inexhaustible source of entertainment. Thus, as a whole, the manifestation of the will in man is related to that in the brute of the higher species, as a note that has been struck to its fifth pitched two or three octaves lower. But between the different kinds of brutes also the differences of intellect, and thereby of consciousness, are great and endlessly graduated. The mere analogy of consciousness which we must yet attribute to plants will be related to the still far deader subjective nature of an unorganised body, very much as the consciousness of the lowest species of animals is related to the _quasi_ consciousness of plants. We may present to our imagination the innumerable gradations in the degree of consciousness under the figure of the different velocity of points which are unequally distant from the centre of a revolving sphere. But the most correct, and indeed, as our third book teaches, the natural figure of that gradation is afforded us by the scale in its whole compass from the lowest audible note to the highest. It is, however, the grade of consciousness which determines the grade of existence of a being. For every immediate existence is subjective: the objective existence is in the consciousness of another, thus only for this other, consequently quite indirect. Through the grade of consciousness beings are as different as through the will they are alike, for the will is what is common to them all.