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idem cum praecedente liber, forma miltata $rec. Acta Erud. 1746. p. 67. Journ. des Sav»Tom. 129. p. 147.

Guettard , Jean Etienne , Memoires etc.

dans les Mem. de TAcademie des Sciences de-puis. 1 7 51. II en existe un Recueil: Memoiressur les Sciences et les arts. Paris. 1768. 3VolL 4.

Nouvelle Collection de memoires etc. Paris. Tom.I——III 1786. 446 pagg. 4. tabb. aen. 178.

Musard , F. Schreiben an Hrn. Jallabert , von denYersteinerungen , aus dem Mercure de France1753. Naturforsclier , 6 St. p. 252—258.

Boulanger . ., 'Schreiben betreffend den

Brief des Hrn. Musard an Hrn. Jallabert. Ibid.p. 243—251.

Alerecht , loannis Sebast. , Dubitationes et con-jecturae circa duo petrefacta ex scriniis igno-rantiae repetita.

Acta Acad. Natur. Ciirlos. Vol. IO. p. 211 —2i5.

Gilkes , Moreton , Letter , giving somc accouut ofthe petrefactions near Matlock-baths in Derby-sbire , with his conjectures concerning pfetre-faction in general.

PhiJos. Trausact. p. 352.

Gimma, Gicicinlo, Delia storia naturale delle gemme,delle pietre e di tutti i minerali , overo dellafisica sotterranea ; in Napoli. 1730. 2. Yoll.4. Tom. II agit de marmore etc.—de Cerau-niis , Echinite , Glossopetra , —p. 232. de la-pidibus figuratis, Belemnitis et aliis petrefactis.

Beaumont , Iohrl , junioris ; Two lettres written inSommersetsbire concerning rock-plants, andtheir growtli.

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