under the title
_Liber de astronomia_. In order to bring it into immediate connection
with the corresponding section of the Etymologiae, it is placed
immediately after the third book (devoted to the _quadrivium_, the last
division of which is astronomy) and given irregularly the heading "Liber
quartus," the regular _Liber quartus (De medicina)_ beginning twenty
pages later. Two of the 48 chapters of which it is composed are wanting
here, but by the subdivision of other chapters the number is raised to
58. Zainer of Augsburg, the printer of the first edition of the
Etymologiae, dated 19 November, 1472, followed it the next month with an
edition of _De responsione mundi et astrorum ordinatione ad Sesibutum
regem_, which is the work in question under another title. Printed with
the same type and the same number of lines to the page, it was in effect
treated as a supplement to the Etymologiae.
According to the testimony of a fellow printer, de Lignamine, in the
"Chronica summorum Pontificum," Rome, 1474, Mentelin as early as 1458
was printing at Strassburg 300 sheets a day.
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