We may include in the above class the caves of Mithras, although we find them in a very different locality. The worship and ritual of Mithras originates in Persia. A cultus, however, of a similar kind was also promulgated in the Roman Empire. In the Paris Museum we find a very famous bas-relief, which represents a youth in the act of striking an ox with a steel weapon. It was discovered in the Roman Capitol in a deep grotto beneath the temple of Jupiter. In these Mithras caves vaults are also met with, and passages which on the one hand appear definitely to symbolize by suggestion the course of the stars, and from another point of view also (precisely as still in our own time takes place in our free-mason lodges, where people are conducted through many passages and have to see dramatic scenes and much else) the ways, which the soul must pass through in its purification, albeit it may be true enough that this fundamental meaning is more fully and directly expressed in sculpture and other work than in architecture simply. In a connection somewhat similar we may also mention the Roman catacombs, the fundamental idea of whose construction was certainly something quite other than that of being subservient to aqueducts, sepulchres or any system of drainage.
(_b_) In the _second_ place we may seek for our present use a more definite point of transition from the architecture of independent type in those constructions which have been raised as _housings of the dead_, partly in the form of excavations beneath the ground, and partly as buildings above it. More particularly among the Egyptians this kind of construction, whether subterranean or super-terranean, was associated with a realm of the dead, just as in general among the Egyptians it is a realm of the invisible which in the first instance receives a habitation and is placed before us. The Hindoo burns his dead, or suffers their bones to lie and moulder on the earth. According to the Hindoo's point of view mankind are, or become, god or gods, whichever way one cares to put it, and we are unable to find in their case this assured distinction between the living and the dead regarded as dead. Hindoo constructions, consequently, so far as they do not originate in Mohammedanism, are not dwellings for the dead, and appear generally to belong to an earlier period as we assumed was true of the astonishing excavations described. In the case of the Egyptians, however, the contrast between living and dead asserts itself predominantly. That which is spiritual begins to separate itself essentially from what is material. We have here the resurrection of spirit in concrete individuality, the movement of that process. The dead are therefore retained fast as personality[57], and are secured and preserved securely above the conception of dissolution into Nature, that is into universal evanescence, flood and extinction. Singularity is the principle of the spiritual in its notion of independence, because spirit is only able to exist as individuality, that is personality. Consequently this honour paid to and preservation of the dead can only appear to ourselves as a first and important element in the definition of the existence of spiritual individuality, since it is here that singularity is asserted as maintained rather than abandoned, inasmuch as the body at any rate is treasured and respected as this Nature's own mode of individuality. Herodotus assures us, a fact we have already noticed, that the Egyptians were the first to declare that the souls of men were immortal, and despite the fact that the grasp on spiritual individuality is in their case very incomplete, in so far as in their view the deceased must for three thousand years pass through a whole series of animals belonging to land, water, and air, yet for all that in this conception, and in the embalming of the body, we find fixedly the notion of bodily individuality, and of the independent self-existence as separate from that body.