372 Prof. D. Bierens de Haan on certain 



pages, where begins a collection of tables for the alloyage of silver 

 and gold), contain by J. Neper: — 



Eerste Boeck vande Tellingh door Roetjes, van het gebruyck 

 der Telroetjes intgemeen (Rabdologiae liber I.) . pp. ]-40 

 Tweede Boeck vande Tellingh door Roetjes, van het gebruyck 

 der Telroetjes in Meetdaden ende Werckdaden met behulp 

 van Tafels (Babdologiae liber II.) .... pp. 41-88 

 Aenhangsel van het Veerdigh-ghereetschap van Menighvul- 

 digingh (Appendix de expeditissimo Multiplicationis Promp- 



tuario) pp. 89-112 



Van de Plaetselicke Telkunst (Arithmetica localis) : 



pp. 113-148 

 And by Ez. de Decker, 



Van Coopmans Rekeninghen (Mercantile Arithmetic) : 



pp. 149-308 



The 16 sheets that follow (a-q) contain Jaer- en Maent-Tafels 

 van Interest teghen 5 (6, 7, 8, 7^, 1\, 6§, 6£) ten hondert. 

 (Discount Tables.) 



At the end we find a translation of Simon Stevin's la Disme 

 in 27 pages ; it has a title by itself (and is printed separately \ 

 at least I have a copy quite identical with it). 



De II Thiende. || Leerende door || onghehoorde lichtigheyt 

 alle re- || keninghen onder den Menschen noodigh val- || lende, 

 afveerdighen door heele ghetal- || len, sonder ghebrokenen. || 

 Door Simon Stevin || van Brugghe. || Ter Govde, || By Pieter 

 Ramniaseyn, Boeck- || vercooper, inde Corte Groenendal, int 

 Duyts || Vergult AB C. || M.DC.XXVI. 



De Decker, a surveying engineer, gave lessons in mathema- 

 tics [Preface : " Terwyl ick inde Vermaerde stadt Gouda Professie 

 doende van de Meetkonst ende Rekenkonst'"'] ; but he did not 

 understand the Latin language [Pref. : "Doch also ick inde La- 

 tijnsche sprake onervaren was "] , and therefore had recourse to 

 Adriaen Vlacq, who was at that time bookseller, it seems, under 

 the firm of Pieter Bammaseyn ; for in the copy of the Privilege, 

 which is given to Vlacq himself [" conventeren en accorderen 

 mits desen Adriaen Vlacq"] for ten years, it is decreed that in case 

 of counterfeiting there be forfeited the sum of a hundred and 

 fifty guilders, in order to give a third part to the officer that shall 

 make the challenge, another third to the poor, and the last third 

 to Adriaen Vlacq. This Vlacq, a young man of 26 years, who un- 

 derstood the Latin language, and was at the same time a good ma- 

 thematician [Preface : " den konstlievenden Ionghman Adriaen 

 Viae, die hem doenmael met grooten yver inde Meetkonst 

 oeffende"] , translated for de Decker the ' Mirifici Logarithmorum 

 Canonis Description of JoannisNeperi; but this seemed to take too 

 high a flight for de Decker's purpose. He was better pleased 



