This is a small, miscellaneous collection of letters written to Alexander Brownlee, C. Scott, F. W. Surman, and Otto Zacharias. There are references to lunar tidal waves and mentions of Charles and Erasmus Darwin.

These letters are to William Hepworth Dixon, who was editor of the "Athenaeum," a journal of literature, science, the fine arts, music, and drama, from 1871 to 1900. They concern current publications and publishing expenses, Michael Faraday, astronomy, perspective, M. F. Maury, P. B. Du Chaillu, all in relation to the "Athenaeum" or letters to the editor thereof.

This volume contains reports made for the Académie des Inscriptions et Belles Lettres on such topics as astronomy, geometry, and natural history.

This collection concerns astronomical observations, earthquakes, meteorology, photography, physics, professional associations, publications, and scientific instruments. The correspondents include Augustus De Morgan, Dionysius Lardner, Sir Francis Beaufort, and Sir Edward Ryan.

This is a miscellaneous collection of letters, almost all written to Smyth by prominent scientists. The topics discussed include astronomy, microscopes, nautical almanacs, and submarine excursions. Also of interest is a letter from Thomas Graves, reporting what the Beagle (Charles Darwin's voyage) was encountering in South American waters.

This volume was kept while Piggott was imprisoned by Napoleon at Fontainebleau. Subjects mentioned include astronomy, comets, and botanical gardens.