Squire continued to elaborate upon his supposed Tregian connection for the 1899 publication of music from the Fitzwilliam Virginal Book. Recognizing that the John Bull piece was not the 1621 work removed the obstacle to hypothesizing that Tregian was the copyist. In the introduction to the edition, Squire wrote "...it may be conjectured with much plausibility that Fitzwilliam Virginal Book was written by the younger Tregian to while away his time in prison." The editors added some scepticism, noting that handwriting samples would be needed to verify Tregian's handwriting. Because of the wide distribution of this 1899 edition of the Fitzwilliam Virginal Book due to reprints, Squire's strongest endorsement of Tregian has gained near-acceptance as fact. In the second (1910) and third (1928) editions of "Grove's Dictionary of Music and Musicians", Squire mitigated his view of Tregian's responsibility, retreating from the claim that he had copied the work, but believing that it was still associated with him.