In a letter of 16 Dec. 1876 Hort wrote to Tregelles' widow:
My dear Mrs Tregelles,
I was much obliged for the Catalogue, and am now very glad to hear the sale was so successful. It was certainly a most remarkable library. I only hope the books will for the most part fall into hands a quarter as able and willing to use them as those of their late master.
I like this expression of Hort's appreciation for Tregelles and I take this to refer to a Catalogue used for the sale (or auction) of the library of S.P. Tregelles in 1876 (he died in April 1875). But I have not been able to find a copy of this catalogue. [There is Tregelles manuscript material in the British Library, John Rylands Library, St Andrew's University Library and Cambridge University Library (indirectly), but none of these seem to have the catalogue.] I suspect there may be some way into this via book collectors and book sellers of the nineteenth century, but I wonder if any one out there has any suggestions. Another complication is not knowing the exact title of the Catalogue.