OP ARTS AND SCIENCES. 97 



ten pages of the catalogue itself; that is, they form a part of the first 

 signature. But the preface to the first century of the Zutrage, which 

 bears date 22 Dec., 1818, directly refers to a work of this nature 

 as an unpublished desideratum. Further than this, not only are all 

 the butterflies of the first century of the Zutrage referred to by number 

 in the Verzeichniss,* but a species figured in the second century (Lycus 

 Niphon (Nos. 203-4) is referred to both by name and number in 

 the Yerzeichniss, page 74. Now the preface to the second century 

 bears the date 23 Dec., 1822. If we consider this the date when the 

 plates of that part were completed, as is probable, then we must make 

 the same supposition of the first century, viz., the very end of 1818 ; 

 and hence page 74 of the Verzeichniss, or, in other words, its fifth 

 signature, and all following it, could not have been printed before two 

 years after the Verzeichuiss is dated. On page 312 of the Verzeich- 

 niss are references by number to the Zutrage, Nos. 395-6 and 429-30 

 the former on the last page of the second century, and the latter on the 

 twelfth page of the third century, which dates from 27 Aug., 1825. 

 Supposing, as- before, that the preface of each part was not printed 

 until the engraving of its plates was completed (which makes the least 

 discrepancy), we cannot put an earlier date to page 312, or the twen- 

 tieth signature, than 1823. It is questionable whether we can be so 

 lenient as this ; for it is stated by Geyer in Thon's Archiv (I. 29-30) 

 that Hiibner prepared Franck's Catalogue late in 1825. In this sale 

 catalogue (p. 100) a list of the works of Hiibner and other entomologists 

 is given with prices annexed ; and among them appear eighteen sig- 

 natures (Bogen) of the Verzeichniss, probably all published at that 

 time. We may therefore fairly conclude that, while this work was com- 

 menced in 1816, it was issued in signatures; that by the end of 1818 

 only the first five signatures were printed, and by the end of 1822 only 

 the first twenty. More probably, however, only the first eighteen sig- 

 natures were printed before the autumn of 1825. The work was com- 

 pleted by Hubner and wholly published by 1827, judging from Geyer's 

 list of Hiibner's works given in Thon's Archiv f (1. c.). Doubtless a 



* Excepting only Nos. 193-4, which are not referred to at all ; and a few 

 of the later ones, which are referred to by name only, viz., Nos. 163-4 on 

 page 9 of the Verzeichniss, 187-8 on page 11, 188-90 on page 80, and 197-8 

 on page 47. 



. t The price of the work is given there as 44 kreutzers only, while that of 

 the Syst.-alph. Verzeichniss, not one-fifth its size, as 54 kreutzers. This may 

 probably be accounted for by the greater rarity of the latter, rather than by an 

 incomplete condition of the former. 



VOL. x. (2D s. ii.) 13 



