Correspondence of David Gill and related papers regarding the International Astrographic Chart, divided into sections by correspondent: Professor Bakhuyzen, Leiden; W.H.M. Christie, Greenwich; Ellery, Melbourne; Professor Foerster, Berlin; J.C. Kapteyn, Groningen; Lord McClaren, Edinburgh; Admiral Mouchez, Paris; Professor C. Pritchard, Oxford; H.C. Russell, Sydney; G.G. Stokes, Royal Society; O. Struve, Pulkova; H.C. Vogel, Potsdam; and the Royal Astronomical Society Committee. These sections are followed by correspondence concerning general astronomical photographic matters, including a committee to study and collect results of photography.