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+This directory contains the examples for the `chem' language written
+in the book:
+
+    Computing Science Technical Report No. 122
+    CHEM - A Program for Typesetting Chemical Diagrams: User Manual
+    by Jon L. Bentley, Lynn W. Jelinski, Brian W. Kernighan
+
+The book is available in the internet at
+<http://cm.bell-labs.com/cm/cs/cstr/122.ps.gz>.
+
+Many of the examples had to be fixed.  Unfortunately, the `chem' akw
+version does not run on many of these programs.  But the Perl version
+of `chem' works on all examples.
+
+Most examples do not use the modern chemical display.  They have C
+atoms added, whereas the modern method omits all C atoms and their
+directly appended H atoms.
+
+The examples are named and sorted by the chapter where they are found
+in the book.  For example, the file `ch4c_colon.chem' means a `chem'
+example in chapter 4; according to `c', it is the third example in
+this chapter; the name `colon' is used to describe the context of the
+example.
+
+You can view the graphical display of the examples by calling
+
+    groffer <file>
+
+`groffer' calls `chem' automatically.
+
+If you want to transform example files to a different format use the
+`roff2*' programs:
+
+`roff2dvi' prints dvi format to standard output,
+`roff2html' generates html output,
+`roff2pdf' outputs pdf mode,
+`roff2ps' produces PostScript output,
+`roff2text' generates text output in the groff device `latin1',
+`roff2x' prints the output  in  the  groff  device  X  that  is
+         suitable  for programs  like `gxditview' or `xditview'.
+
+To get a suitable `groff' output run
+
+    @g@chem <file> | groff -p ...
+
+
+####### License
+
+Last update: 5 Jan 2009
+
+Copyright (C) 2006, 2009 Free Software Foundation, Inc.
+Written by Bernd Warken.
+
+This file is part of `chem', which is part of `groff'.
+
+`groff' is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+`groff' is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+####### Emacs settings
+
+Local Variables:
+mode: text
+End: