Sentence:  Gather hence great joy at the Resurrection of the B. Virgin, and the <WSD>incorruptibility</WSD> of her body, the rare and speciall priviledge graunted unto her by her most holy Son, who fullfilled the desires of her soule. 
Meaning of the word marked with <WSD> tags:  The condition of never decaying or decomposing (especially, as ascribed to the bodies of holy people in Roman Catholic and Eastern Orthodox Christianity).