342 Proceedings of the British Association. 



the teeth are of young animals, but no indentations have been found 

 upon them. No skulls have been discovered, nor any coprolites. 

 The bones frequently contain gelatine, and have often manganese 

 upon them ; hair was also discovered. The stalactites seem con- 

 fined to the anterior part of the cave ; in the posterior part a fine 

 sand is found. 



After this, a desultory conversation took place on the exhibition 

 of two models by Mr. Ibbotson, one of the country round Neufcha- 

 tel, in Switzerland, on the scale of half an inch to the mile; and the 

 other of a part of the Under Cliff in the Isle of Wight, on the scale 

 of three feet to the mile. 



Mr. Greenough mentioned a new mode of engraving medals late- 

 ly adopted in France, and which he conceived could be advanta- 

 geously employed in laying down the varieties of surface on maps. 

 — Mr. Griffiths spoke of the great importance of models like Mr. 

 Ibbotson's, as being so well calculated to display the geological 

 structure of a country. He suggested the importance of possessing 

 maps, both of outline and of features, and he alluded to the magnifi- 

 cent map of Ireland, under the Ordnance Survey, the scale of which, 

 being six inches to a mile, enabled the geological observer to trace 

 the geological features with a facility before unknown. — It was men- 

 tioned, that the new map of Austria was on a scale of twenty-two 

 inches to the mile, but this Mr. Greenough considered inconven- 

 iently large. — Mr. Ibbotson stated, that models could be easily mul- 

 tiplied by employing a metal mould, and using papier ntache, or 

 some preparation of caoutchouc ; and that they might be dissected 

 to exhibit the internal structure, and that the materials of the strata 

 themselves could be used as coloring matter. — Lord Northampton 

 and M. de la Beche gave their testimony of approval. — Several 

 gentlemen then spoke of the application of combinations of letters to 

 geological maps, to express the more minute geological phenomena; 

 but the general opinion was, that in geological maps simplicity 

 should, as much as possible, be preserved, and that the best mode 

 would be to have two maps of the same district, one without names,, 

 for the geological map, and the other with the necessary writing. 

 Maps of this kind had been given to the Geological Society by the 

 Archduke John of Austria. 



Section D. — Zoology and Botany. 

 President. — Prof. Henslow. 



