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This is an 1880 book, The Apparitions and Miracles at Knock, prepared and edited by John MacPhilpin of Tuam and published in Dublin by M. H. Gill and Son. The Internet Archive holds a Google scan of the Harvard College Library copy. It reprints Tuam News accounts and the official depositions of eye-witnesses to the apparition of 21 August 1879 on the sacristy gable of Knock Church, County Mayo. It argues that natural light could not have caused the apparition and lists cures recorded in Archdeacon Cavanagh's diary.
“Nevers”13 pages
last. It is thus seen that there are two gables between the altar of the church and the gable fronting the south-east, and that, consequently, if lights appeared in the church, the reflection from them could never beam on the outside at the foot of the wall of the second gable; above all, direct light could never convey, by any law of optics, images when radiating from a centre, and not passing through any other translucent medium, from which the rays of light might, at a certain fixed and measured distance, carry the image of the In the foregoing diagram A represents the church; B the sacristy; C the gable against which the apparition was seen; D the boy's school; E the grave of Mr. O'Grady, the father of the parish priest who built the church; F the girl's school. object or pellucid picture. The time at which the apparition appeared was some twenty minutes after sunset, so that by no
Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 91 pages are in the text index: search them above, or from the library's search.