Dr. Schafhaeutl on the Different Species of Cast Iron, SfC. 297 



M. Deshayes, however, has lately remarked that true Am- 

 inonites (with denticulated lobes, I presume) have been found 

 in strata more ancient than the coal formation, namely, in the 

 environs of Tournay *. 



In reference to my successive memoirs on the east and 

 south of Ireland, I will here add the general remark, that it 

 has been my endeavour in both to embody in few words the 

 results of practical experience and observations conducted at 

 intervals in that country during a lapse of more than forty 

 years; and in laying them befoi'e the public, it has been my 

 object, in both cases, to exhibit through the medium of con- 

 densed abstracts a compendious view of the relations of the 

 tracts described, thus relieving the reader from the labour 

 and tedium of passing through the progressive steps of ex- 

 tended researches. That a minute examination of the ground 

 which I have trodden may lead to further discoveries, par- 

 ticularly in respect of the distribution and number of the 

 organic remains, I am far from disbelieving, and I shall be 

 ready to hail their appearance with pleasure; but as in the 

 development of the main relations of the mineral masses I 

 have endeavoured to be exact, I may be excused if I do not 

 anticipate any very great accession to our knowledge in the 

 latter respect. 



[To be continued.] 



L. On the Conibinations of Carhon teith Silicoji a?id Iron, 

 and other Metals, forming the different Species of Cast Iron, 

 Steel, and Malleable Iron. By Dr. C. Schafhaeutl, of 

 Munich. 



[Continued from p. 50.] 



T SHALL now describe another action of acid bodies on 

 *- iron, which has much resemblance to that which is exerted 

 by the action of sea water on it. 



I poured over a parallelopipedic fragment of tilted but very 

 teiider and indifferent razor-steel, in a tea-cup, concentrated 

 hydrochloric acid. After the action had for the most part 

 ceased, I changed it for fresh acid, and all visible action of this 

 fresh acid had ceased the next day. The cup was preserved in 

 this state without being disturbed for nearly two months. After 

 this lapse of time I found the fragment, apparently unchanged, 



the Royal Academy of Sciences of Berlin, published, with the preceding 

 Memoir, in 1832. 

 * Bulletin dela Societe Giologique de France — Seance de 19 FevrierylS^S. 



