 This latter passion led to his becoming familiar with many European libraries, where he also became aware of holdings of early English liturgical manuscripts.The promised subscribers including many Anglican bishops and other dignitaries, but also Léopold Delisle of the Bibliothèque nationale, Paris, Antonio Maria Ceriani of the Ambrosian Library, Milan and others Catholics such as W.H.James Weale, Edmund Bishop, Dom Aidan Gasquet, the abbé Louis Duchesne, and Dom Hildebrand de Hemptinne, abbot of Maredsous.