§ 38.2. =The Antiquities of the Catacombs.=--The custom widely spread in ancient times and originating in piety or superstition of placing in the tombs the utensils that had been used by the deceased during life was continued, as the contents of many burial niches show among the early Christians. Children’s toys were placed beside them in the grave, and the clothes, jewels, ornaments, amulets, etc., of grown up people. Quite a special interest attaches to the so-called Blood Vases, _Phiolæ rubricatæ_, which have been found in or near many of these niches, _i.e._ crystal, rarely earthenware, vessels with Christian symbols figured on a red ground. The _Congregation of rites and relics_ in A.D. 1668, asserted that they were blood-vessels, in which the blood of the martyrs had been preserved and stood alongside of their bones; and the existence of such jars, as well as every pictorial representation of the palm branch (Rev. vii. 9), was supposed to afford an indubitable proof that the niches in question contained the bones of martyrs. But the Reformed theologian Basnage shows that this assumption is quite untenable, and he has explained the red ground from the dregs of the red sacramental wine which may have been placed in the burial niches as a protection against demoniacal intrusion. Even many good Roman Catholic archæologists, Mabillon, Papebroch, Tillemont, Muratori, etc., contest or express doubts as to the decree of the _Congregation_. At the instigation probably of the Belgian Jesuit Vict. de Buck, Pius IX. in A.D. 1863 confirmed and renewed the old decree, and among others, Xav. Kraus has appeared as its defender. But a great multitude of unquestionable facts contradict the official decree of the church; _e.g._ the total absence of any support to this view in tradition, the silence of such inscriptions as relate to the martyrs, above all the immense number of these jars, their being found frequently alongside the bones of children of seven years old, the remarkable frequency of them in the times of Constantine and his successors which were free from persecution, the absence of the red dregs in many jars, etc. Since dregs of wine, owing to their having the vegetable property of combinableness could scarcely be discernible down to the present day, it has recently been suggested that the red colour may have been produced by a mineral-chemical process as oxide of iron.