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 would not be unlawful to make experiments with a view to finding out the truth; divination comes in when by such means the sitters seek to discover what it is certain none of them knows, consciously or unconsciously.

It is well to bear in mind a remark which St Thomas Aquinas makes after St Augustine, that the devil wishes to excite among men a greater curiosity about occult matters " so that being implicated in these observances, they may become more curious and get themselves more entangled in the manifold snares of pernicious error."

1. The term vain observance is used by theologians to designate various kinds of superstition by which altogether disproportionate means are employed to procure a sure and certain effect. It comprises the use of charms, spells, and cabalistic signs, which are used to preserve persons and things from harm, or cure wounds and diseases, or acquire knowledge without the labour of study. It also signifies the superstitious observance of chance events and days, some of which are considered lucky, others unlucky. Magic is the art of wonderworking by the help of the devil.

2. Vain observance, or witchcraft and magic, is gravely sinful for precisely similar reasons as divination is. There is only an accidental difference between these kinds of superstition, for while divination uses disproportionate means to discover what is hidden by the help of the devil, witchcraft uses disproportionate means to obtain certain and wonderful effects by his help. Morally, therefore, there is no difference between divination and witchcraft. Like divination, witchcraft may contain an express or tacit compact with the devil, and although if the compact be express there will always be mortal sin, there will frequently be only venial when the compact is tacit. Ignorance or good faith or want of full confidence in the effect will in that case frequently excuse from serious sin. Moreover, there must be advertence to the total inadequacy of the means to obtain the effect desired, and to the danger of the devil's intervention, otherwise there will not be the sin of superstition. And so people who do not like to undertake any journey on a Friday, or to sit down with thirteen