Preface

        Previous version of CRYPTOS were developed to run on Digital 
Equipment Corporation PDP 11/70 and VAX mini-computers. The last version of
CRYPTOS (version 4.0) to be released to the public became available in 1982.
Since then, as part of a separate research project supported by the Northern
California Forest Yield Cooperative, we have developed the California 
Conifer Timber Output Simulator (CACTOS). CACTOS used much of the theoretical
structure and many of the actual parts of CRYPTOS. A logical next step in
this evolution was to put the CRYPTOS growth routines into the new simulator.
Thus, version 5.0 of CRYPTOS was born.

        The work that led to CRYPTOS and CACTOS has depended upon the efforts 
and money of our industry cooperators. This cooperation effort should continue.
THus, we ask every CRYPTOS user to keep us informed of the program use. Also,
whenever available, we hope to remain informed of the results of any tests 
of the CRYPTOS program performed against actual growth data.