ANNIVERSARY ADDRESS OF THE PRESIDENT. CIX 



under known conditions, by M. Charles Desmoulins ; on the transport 

 of certain erratic blocks of Scandinavia and North America by floating 

 ice, considered as a consequence of the ancient extension of glaciers 

 and the changed level of those countries, by M. Ch. Martins ; on the 

 fossils in certain flints found in the Perigord, by M. Ch. Desmoulins ; 

 on the ancient glacier of Wesserling, by M. Ed. Collomb. Also papers 

 by M. Blanche on part of the Lebanon ; on the Dole (Jura), by MM. 

 Lory and Pidancet ; on an artesian well, sunk 433 feet, at Venice, 

 with an interesting and detailed section, by M. de Challaye ; on Elba, 

 by M. de Collegno ; on the Jurassic rocks of the southern part of the 

 basin of the Rhone, by M. Victor ThioUiere ; on the geological struc- 

 ture of the Isthmus of Panama, by Mr. Evan Hopkins ; on human 

 fossils found in the volcanic mountain of Denize, the mammiferous 

 remains noticed in the different deposits of the Haute-Loire, and the 

 probable age of their entombment, by M. Aymard; on the different 

 species of the Mastodonts of the Velay, by M. Aymard ; on the an- 

 cient glaciers of the Jura, by M. Favre ; on the more recent geolo- 

 gical memoirs read before the Friends of Natural Science of Vienna, 

 by M. Bone, — a condensed and valuable notice. There were memoirs 

 and notices on depots blocailleux (a name given to deposits containing 

 a more or less large quantity of angular fragments), by M. Omalius 

 d'Halloy ; on the ridging of the earth's surface, on the nature of un- 

 consolidated accumulations, and on the theory of floating ice, by M. 

 Frapolli ; on Tantaliferous Wolfram of the Haute-Vienne, by M. Da- 

 mour ; on facts and considerations in aid of a classification of the 

 nummulitic rocks, by M. Victor Raulin ; on the Mag as pumilus, by 

 Mr. Davidson and M. Bouchard-Chantereaux. These communica- 

 tions were followed by papers or notices, on the depression of Northern 

 Africa beneath the level of the sea, by M. Angelot ; on the siliceous 

 incrustation of the Geysers, and on different natural hydrates of silica, 

 by M. Damour ; on the upper tertiary deposit of Sundgau (Upper 

 Rhine), and on the transformation of the felspathic pebbles of this 

 deposit into kaolin, by M. Daubree ; on the mines of the environs of 

 Bone and Philippeville (Algeria), by M. Paul Benoist. To these 

 succeed a reply to MM. Martins and Desor respecting the theory of 

 floating ice, and analysis of a MS. notice of M. Paul Weibye of Kra- 

 geroe on that of waves, with a notice of the recent observations of 

 M. Forchhammer on the polished and striated surfaces of Denmark, 

 by M. Frapolli; and remarks on this reply by M. Ch. Martins. 



M. Ed. Collomb gave an account of fossil plants found in Devonian 

 or Silurian rocks near Wesseiling ; and there were papers on dolomi- 

 tization by DeMorlot ; on a geological survey of the basin of LaComte, 

 by M. Leprieur ; on the classification of the ungulated mammifers, 

 by M. Pomel ; on a temporary glacier (January and February 1848) 

 in the Vosges, by M. Ed. Collomb ; on agricultural geology, more 

 especially of a domain near Nancy, by M. Neree Boube'e ; on the 

 fossil bones of the environs of Alais, by M. d'Hombres-Firmas ; on 

 the nature of the rocks of the domain of Gastilitza, near St. Peters- 

 burg, and on the fossils found in them, by Prince Emmanuel Ga- 

 litzin ; on the deposits between the white chalk and the calcaire 



