diff -r 741f3108a90f -r e997802b855c src/demo/sub_graph_wrapper_demo.cc
--- a/src/demo/sub_graph_wrapper_demo.cc	Sat Nov 13 12:24:01 2004 +0000
+++ b/src/demo/sub_graph_wrapper_demo.cc	Sat Nov 13 12:53:28 2004 +0000
@@ -37,10 +37,10 @@
 
   readDimacs(std::cin, g, length, s, t);
 
-  cout << "edges with lengths (of form id, tail--length->head): " << endl;
+  cout << "edges with lengths (of form id, source--length->target): " << endl;
   for(EdgeIt e(g); e!=INVALID; ++e) 
-    cout << " " << g.id(e) << ", " << g.id(g.tail(e)) << "--" 
-	 << length[e] << "->" << g.id(g.head(e)) << endl;
+    cout << " " << g.id(e) << ", " << g.id(g.source(e)) << "--" 
+	 << length[e] << "->" << g.id(g.target(e)) << endl;
 
   cout << "s: " << g.id(s) << " t: " << g.id(t) << endl;
 
@@ -75,6 +75,6 @@
   for(EdgeIt e(g); e!=INVALID; ++e) 
     if (flow[e])
       cout << " " << g.id(e) << ", "
-	   << g.id(g.tail(e)) << "--" 
-	   << length[e] << "->" << g.id(g.head(e)) << endl;
+	   << g.id(g.source(e)) << "--" 
+	   << length[e] << "->" << g.id(g.target(e)) << endl;
 }