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In page Denham Tracts:

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This is a long list of spirits, fairies, bogies and other creatures, based on an older list in the Discoverie of Witchcraft, dated 1584,[1] with many additions, a few repetitions and mention of many creatures that do not appear elsewhere. While the fact that the tracts contain creatures that are not referenced anywhere else could indicate that Denham had researched the subject more thoroughly than others of his time, a lack of other sources makes some think this unlikely despite Denham being regarded as a trustworthy source of information.