why (as may be expected in the case of such publications), a considerable percentage are written in Latin. However, a goodly number of books are on the Index because they are detrimental to good morals. There are very few there which treat of the natural sciences. The Index will not busy itself with publications on electricity or X-rays, unless an author on a subject of this sort devote a considerable part of his work to attacks upon religion.
There are some well-meaning people who, while agreeing that the productions of Zola, Dumas and other writers of the same sort, fully deserve condemnation, cannot understand why works like Ranke's History of the Popes, which is an acknowledged authority in its line, should be proscribed. Such works are not on the Index for the good things they contain, but for the poison they mix with the wholesome food so cleverly that it takes more than ordinary scholarship and discretion to separate the one from the other.
The Roman Committee of Cardinals, which has charge of this part of ecclesias-
