Observationes ponderis testudinis terrestris, cum in autumno terram subiret, cum ejusdem ex terrâ verno tempore exeuntis pondere comparati, per plures annos repetitæ: experimento celeberrimi D. D. Georgii Ent, Equitis, & M. D. & à Doctissimo D. D. Rob. Pitt, M. D. & R. S. S. communicatæ
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