Dr. Scbafhaeutl on the Different Species of Cast Iron^ 297 
M. Deshayes, however, has lately remarked that true Am- 
monites (with denticulated lobes, 1 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 before 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 Combinations of Carbon Kcitli Silicon and 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 
tender 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 w^as 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, wdth the preceding 
Memoir, in 1832. 
* Bulletin de la Societe Geologique de France — Seance de 19 Fevrier,\%^S, 
