Xlii PEOCEEDINGS Or THE 



lichen Akademie der Wissenschaften, MatherQatiscli-naturwis- 

 senschaftliclie Classe. The form first adopted was in folio, which, 

 after the first four volumes, was reduced to large quarto, and has 

 been preserved to the present time with great luxury of typography, 

 and the work is illustrated by a profusion of plates, many of them 

 beautiful in execution. The last volume received is the twenty- 

 third, dated 1864 ; each one is divided into two parts, with separate 

 pagings, entitled Abhandlungen von Mitgliedern der Akademie, 

 and Abhandlimgeu von JSTichtmitgliedern, according as the 

 authors of the papers are members of the Academy or non- 

 members, a most inconvenient division, as complicating references 

 and the more so as a difierent division is adopted for the Pro- 

 ceedings. A considerable portion of these volumes is, as usual, 

 occupied by mathematical, physical, chemical, geological, &c., 

 papers, and in jN"atural History Palaeontology takes a conspicuous 

 place, including Ettingshausen's papers on fossil ferns and other 

 impressions ; and, in illustration of them, on the variation of re- 

 cent leaves and ramifications of ferns, with a large number of na- 

 ttire-printed plates. In recent zoology and botany there are many 

 contributions to zoological Anatomy, especially of the lower orders, 

 by Hyrtl and Langer; to Ichthyology by Heckel, Ejier, and 

 Steindachner ; to Helminthology by Diesiug, with one on the 

 same subject by Molin ; an entomological paper by KoUar ; 

 Schmarda on Egyptian microscopic and other lower animals ; 

 Schwartz v. Mohrenstein's Monograph of Eissoidse ; Schmidt's 

 Herpetology of the Cracow Museum ; several contributions by 

 linger to vegetable Physiology and Palaeontology; a few sys-, 

 tematic botanical papers of Fenzl's in the earlier volumes ; Lorenz 

 on ^gagropila ; Eeichhardt on the Anatomy of Fern-stems ; Eritz 

 on Thermical Constants for the flowering and fructification of 

 garden-Plants ; and Berger on the popular German names of 

 Plants, the latter honoured with more typographical display than 

 the subject, or the manner of treating it, seems to require. 



. The Proceedings, in octavo, commenced with the Transactions, in 

 two separate series for the two classes. Eor the Mathematical 

 and Natural Class, under the title of Sitszungsberichte der ma- 

 thematisch-naturwissenschaftlichen Classe der kaiserlichen Aka- 

 demie der Wissenschafben, forty- two volumes appeared up to the 

 close of 1860, with copious indexes for each of the first three ten- 

 volumes, and for the last twelve. In 1861 they were further 

 divided into two separate series : the first for Mineralogy, Botany, 

 Zoology, Anatomy, G-eology, and Palseontology ; the second for 



