In Spain of the sixteenth and seventeenth centuries there were employed, for the adornment of the altar, certain objects which would appear, although perhaps originally designed for another purpose, to be closely related to the altar-cards now commonly (and even in the sixteenth century to some extent) a feature of the celebration of the Mass. Their employment would seem to have been fairly extensive, since a good many examples, of one kind or another, still survive. The Spanish name for them—sacra—is the same as that for the altar-cards, three in number, now ordinarily set upon the altar in Roman Catholic churches, in other countries as well as in Spain; and, correspondingly, the name I have heard applied to them in English is ‘altar-card’. They are of considerable interest, not alone because, as often, of their design or their workmanship, but also, seemingly, from their position as relics of a step in the liturgical history of the Roman Church in Spain.