Richards, O. W.
Phase Microscopy 1954-1956.  Science 124: 810-814 (1956).

Phase microscopy has become a recognized standard method. Few publications now refer to it in the title, and a complete listing of papers is no longer possible. Some of the uses of phase microscopy in the first 2 years of the second decade since we demonstrated the first American instrument (1) are summarized here as well as a few papers missed in the preview review (2). Details on the function and use of the instrument in various fields are available (2, 3).