Correspondence and printed papers on astrology, chemistry, electricity, galvanism, geology, optics and squaring the circle. The correspondents include T. Andrews, W.H. Miller, W. De La Rue, W. Huggins, W. Klinkerfeus, J. Challis and L. Respighi. There are official printed reports on the Anglo-Australian Telegraph; specimens of output from printing telegraphy; a prospectus for a book titled 'Physical and historical evidences of vast sinkings of land on the North and West coasts of France and South-Western coasts of England, within the historical period' by R.A. Peacock; a diagram by Airy of an instrument for showing the law of refraction in water; a printed paper by C.A. Young titled 'Spectroscopic Notes'; and letters and diagrams relating to an aberration instrument.