This first supplement adds the following new topics to subjects covered in Volumes I and II: polution instrumentation, human engineering, physical properties analyzers, ion selective electrodes, and instrument installation materials. Furthermore, it reports on the new developments in the already discussed areas of process measurement, computers, displays and control systems. Because this supplement will be used by the reader as part of his set of earlier published volumes, care has been taken to organize these three volumes into a convenient single reference source, in which emphasis is on quick access to specific information, and repetition is eliminated by the extensive use of cross referencing.