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Johann Balthasar Ehrhart
EHRHART, Johann Balthasar.

EHRHART, Johann Balthasar.
(1700? - 1757?)

(Born: 1700?; Died: 1757?) Swedish palaeontologist.

Ehrhart was Physicus in Memmingen, and a member of the Leopoldian Academy.

Biographical references: Meusel, Verstorbenen Teutschen Schrifsteller, 1802-16. Poggendorff: 1, col. 648.

1. Latin, 1724 [First edition].
Dissertatio de belemnitis Suevicis. Lugduni Batavorum, 1724.

4°: 21 p.

Very scarce. In this important paper on fossils in Sweden, Ehrhart was able to show that belemnites, long thought to be inorganic fossils, had a distinctive chambered shell "analogous to that of the living cephalopod molluscs Nautilus and Spirula. Combined with his careful analysis of the mode of growth of the ‘guard,' this structural analogy made the organic origin of belemnites almost indisputable" (Rudwick). Ehrhart cites as his sources Scheuchzer, de Boodt, and Volkmann.

Bibliographical references: LKG: XVII 134. Rudwick, Meaning of Fossils, 1972: p. 88-89.

2. Latin, 1727 [2nd edition].
De belemnitis Suevicis dissertatio. Quo imprimis in obscuri hactenus fossilis naturam inquiritur; dein et haud paucę observationes universum marino-terrestrium censum; itemque lithographię modernę historiam spectantes exhibentur. Editio altera, multum auctior. Cum nova pręfatione. Augustę Vindelicorum, Ulmę, Apud D.R. Merz & J.J. Mayer, 1727.

4°: 57 p., one plate.

Very scarce. A much expanded edition.

Modern German transl., 1979: Balthasar Ehrhart (1700-1756) aus Memmingen (Schwaben) und seine Dissertatio de belemnitis suevicis (1727). Von Otto Wittmann. Übersetzung des lateinischen Originals von 1727 von Paul Willmann. Erlangen, Jūnge, Universitätsbuchdruckerei, 1979. 48 p., illus. [AzU, QE1 .E7 no.107.]

Bibliographical references: LKG: XVII 134.

3. German, 1745.
Physikalische Nachricht von eier gegrundeten neuen Meinung, welche den Ursprung der aus der Erden kommenden verdteinten Sachen, die bisher der allgemeinen Sundlichen zugeschrieben worden, betrifft, wie solche in dem bisher rargesehen buche enthalten ist, das den Titul hat: De crostacei - di A.L. Moro, nebst vielen Anmerkungen. Memmingen, 1745.

8°: Very scarce.

Bibliographical references: LKG: XVII 27b.

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