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Art. XIX . — Geological distribution of the Fossil Organic Re- 
mains enumerated by Baron Von Schlotheim, arranged by 
Dr Boue'. 
-A.S Baron Von Schlotheim has not arranged the fossils which 
he has described according to their geological relations, and has 
only promised to do so after the completion of his appendix ; I 
have judged it expedient to present a classification of this kind, 
under the impression that it cannot but prove highly acceptable 
to geologists. Such an attempt may to some, at first sight, 
seem unnecessary, but I am persuaded, that this idea will va- 
nish, when they are informed, that in the work of this celebrated 
naturalist, many of the localities and geological positions are er- 
roneously indicated. These mistakes were, to a certain degree, 
unavoidable, as he had not visited all the places where the dif- 
ferent species occur, but has often been obliged to trust to his 
correspondents, or even to the labels of some old collections pur- 
chased by him. Besides which, geological classification has 
been variously modified, and the secondary formations better de- 
fined, since the publication of his Petrefactenkunde.” To 
correct some of these errors, I have made use of the geological 
details regarding Germany which my own personal observation 
and the works of others have furnished me with. In the mean 
time, it must be gratifying to every German to be assured, that 
when Baron von Schlotheim’s ywk shall be completed, or when 
he shall have figured all the species which he has described, his 
essay will be one of the finest of the kind, and will contain the 
fossils of every formation in Germany. In France and Italy 
the labours of the geological zoologists have been almost entire- 
ly confined to the fossils of the chalk and tertiary deposits ; and 
in England, although the field of observation has been more ex- 
tended, the expensiveness of the coloured engravings renders 
them, in a great measure, accessible only to the rich, which con- 
stitute the smallest portion of the scientific world. It is much 
to be wished, that some person would undertake the task of es- 
tablishing a correct synonymy between the German, English, 
French, and Italian writers on this subject, for, at present, the 
science is but a mass of confusion, encumbered with double 
