374 Prof. D. Bierens de Haan on certain 



meris ab vnitate, || ad 10000. || Govdae, || Typis Petri Ram- 

 masenij. || M.DC.XXVI. (and not the Dutch one mentioned 

 by Mr. Glaisher), and gives ten places of decimals with differ- 

 ences. The second Table occupies the last sheets, A-F, and 

 has the Dutch title: — 



Edmundi Gvnteri I] Tafel|| Van Hoeck-maten ende|| Raeck- 

 lijnen, den Wortel zijnde van || 10000,0000 deelen. 



These Tables are preceded (pages 1-51) by an Explanation 

 [" Onderwijsingh hoemen de || Tafel Henrici Briggii verstaen || 

 sal om te ghebruycken "~\ . 



Now Adriaen Vlacq, being the printer of this smaller work, 

 certainly was already occupied with the calculation of his Tables, 

 that were published two years later (Gouda, 1628) ; and as these 

 contained far more than the great work [groote werck] of de 

 Decker promised or could contain, and as, in the second place, the 

 last of the books before named was a manual that was very con- 

 venient for use, I think we might give these two reasons for the 

 non-appearance of the second volume. Perhaps, also, logarithms 

 being still nearly unknown, de Decker may have sold but few 

 copies of his smaller work (at least it is now very scarce), and 

 have thought it prudent not to commit his purse by editing the 

 larger one. The not selling of this smaller work may have been 

 the reason that a sufficient number of copies was sent to London, 

 where they were added to a work of J, Wells, as Mr. Glaisher 

 has shown. 



I think I have shown that these small Tables were printed, 

 and the English Latin text translated by Vlack, and that de 

 Decker collected these works in his Nieuwe Telkonst ; so that 

 it may be surmised that Vlack, after having completed his own 

 calculations and edited his 'Arithmetica Logarithmica ' in 1628, 

 regarded this, his great work, as completely eclipsing his first 

 essays (which contained many errors), and so did not allude to 

 them at all ; for Vlack was not a boasting, but, on the contrarj?, 

 a very modest man, as may appear in the title, 



Arithmetiqve II Logarithmetiqve || ov || La constrvction 

 et || vsage d'vne Table contenant || les Logarithmes de tous 

 les Nombres de- || puis FVnite jusques a 100000^ || et || d'vne 

 avtre table en || laquelle sont comprins les Logarithmes des 

 Sinus, || Tangentes & Secantes, de tous les Degrez & Minutes 

 du quart du || Cercle, selon le Raid de 10,00000,00000. parties. || 

 Par le moyen desqtjelles on resovlt tres-faci- || lenient les 

 Probtemes Arithmetiques fy Geometriques. || Ces nombres pre- 

 mierement || sont inventez par Jean Neper Baron de || Mar- 

 chiston : Mais Henry Brigs Professeur de la || Geometrie en PVni- 

 versite d'Oxford, les a || change, & leur Nature, Origine & || 

 Vsage illustre selon Pinten-||tion du dit Neper. || La descrip- 



