In the early 1880’s John Dreyer published a compiled version of the various galaxies,
nebula and star cluster catalogs originally created by William, Caroline and John Herschel
called the General Catalog. By 1888 Dreyer had prepared 2 additional supplements to the
GC which led to the publication of the New General Catalogue in the Memoirs of the
Royal Astronomical Society.
John Dreyer **3
In 1908 following the discovery of an additional 5,386 galaxies, nebula and clusters,
mostly by photography, Dreyer created a supplement to the NGC called the Index Catalog (IC).
A list of corrections was published in 1912.
