Correspondence, certificates and manuscript notes, in Danish, French and German. Correspondents include Herman Lynge, F. Didrichsen, and Franz Leydig. Bergh received an appointment as correspondent member to the French Academy of Sciences in 1895 from M.P.E. Berthelot. Most of the material relates to his study of Nudibranchiata, a sub-order of marine gastropod mollusks.

Correspondence, certificates and manuscript notes, in Danish, French and German. Correspondents include Herman Lynge, F. Didrichsen, and Franz Leydig. Bergh received an appointment as correspondent member to the French Academy of Sciences in 1895 from M.P.E. Berthelot. Most of the material relates to his study of Nudibranchiata, a sub-order of marine gastropod mollusks.