Lawlor — Primate Ussher's Librari/ before 16^1. 249 



very difficult to use, and I have seldom consulted it. As before, the 

 press-mark is a letter followed by two Arabic numerals. I represent 

 the pair by the letter C. 



To our next group the letter D may be assigned. It has three 

 members : D.3.6; D. 1.2, and D. 1. 18. These are described in the 

 new Catalogue^ (in the case of the first with a note expressing doubt), 

 as Catalogues of T. CD. Library in 1610. The third is lettered on 

 the back, "Challoner's Catalogue." Here we have a new system of 

 press-marks. To the title of each volume is affixed a letter (either H 

 or T) and three nxmierals. I suppose the letters H and T signify the 

 two faculties of Humanity and Theology, but I have not thought it 

 worth while to verify my guess with any care. The numerals, no 

 doubt, indicate the press, sheli, and position of the volume : the presses 

 being separately numbered in the two divisions of the library. Of 

 these volumes I take D. 1. 18 to be the earliest, as the number of 

 articles in it is much smaller than in either of the others. D. 3. 6 

 and D. 1. 2 follow one another page by page, and to a slight extent, 

 line by line, one being evidently copied from the other. I believe 

 D. 1. 2^ is the later of the two, and, as it is the easier to use, I have 

 confined myself to it. 



I must return to these catalogues. Meanwhile, what has been 

 said will suffice to enable me to explain the use made of them in the 

 following table. In the first column I have placed the press-marks 

 of the volumes in our lists (Catalogue A), in the second, third, and 

 fourth columns, the corresponding press-marks in B, C, D. The fifth 

 column gives the press- marks, late and early, found in volumes of the 

 same titles and editions in the Trinity College Library. The latest 

 change in the press-marks was made not a century ago. As the 

 Library increased, the pressui^e on the available space became serious. 

 Accordingly, the benches which formerly stood in the stalls were 

 removed, and book-cases were put in their place. At the same time, 

 the tables which had stood opposite to them were got rid of, and it 

 thus became possible to add extra shelves to the original book-cases. 

 "When this was done, it became necessary to alter the symbols by which 

 the shelves were indicated. Thus, for example, the volume BB. 15. 26, 

 apparently without changing its place, became BB. :ff. 26. I have in- 

 dicated these two marks in the table together — thus : BB. 15 (&). 26. 

 And, similar cases have been dealt with on the same principle. 



^ Nos. 2, 1, 358. ~ In tMs opinion I am glad to find myself in 



agreement with Dr. Abbott. See his note in the Catalogue of Manuscripts, p. 1. 



