Now Mr. Ruskin says: "That the original conception of Gothic architecture has been derived from vegetation, from the symmetry of avenues and the interlacing of branches, is a strange and vain supposition. It is a theory which never could have existed for a moment in the mind of any person acquainted with early Gothic; but, however idle as a theory, it is most valuable as a testimony to the character of the perfected style." Doubtless so. But you must remember always that the subject of my lecture is Grots and Groves; that I am speaking not of Gothic architecture in general, but of Gothic ecclesiastical architecture; and more, almost exclusively of the ecclesiastical architecture of the Teutonic or northern nations; because in them, as I think, the resemblance between the temple and the forest reached the fullest exactness. Now the original idea of a Christian church was that of a grot--a cave. That is a historic fact. The Christianity which was passed on to us began to worship, hidden and persecuted, in the catacombs of Rome, it may be often around the martyrs' tombs, by the dim light of candle or of torch. The candles on the Roman altars, whatever they have been made to symbolise since then, are the hereditary memorials of that fact. Throughout the North, in these isles as much as in any land, the idea of the grot was, in like wise, the idea of a church. The saint or hermit built himself a cell; dark, massive, intended to exclude light as well as weather; or took refuge in a cave. There he prayed and worshipped, and gathered others to pray and worship round him, during his life. There he, often enough, became an object of worship in his turn, after his death. In after ages his cave was ornamented, like that of the hermit of Montmajour by Arles; or his cell-chapel enlarged, as those of the Scotch and Irish saints have been, again and again; till at last a stately minster rose above it. Still, the idea that the church was to be a grot haunted the minds of builders. But side by side with the Christian grot there was throughout the North another form of temple, dedicated to very different gods, namely, the trees from whose mighty stems hung the heads of the victims of Odin or of Thor--the horse, the goat, and, in time of calamity or pestilence, of men. Trees and not grots were the temples of our forefathers. Scholars know well--but they must excuse my quoting it for the sake of those who are not scholars--the famous passage of Tacitus which tells how our forefathers "held it beneath the dignity of the gods to coop them within walls, or liken them to any human countenance; but consecrated groves and woods, and called by the name of gods that mystery which they held by faith alone;" and the equally famous passage of Claudian, about "the vast silence of the Black Forest, and groves awful with ancient superstition; and oaks, barbarian deities;" and Lucan's "groves inviolate from all antiquity, and altars stained with human blood."