// Set up the substance selector box
 private void setUpList() {
   List s = system.getSubstances();
   for (Object o : s) {
     Substance sub = (Substance) o;
     substanceBoxModel.addElement(sub.getName());
   }
 }
 public void setUpList() {
   List substances = system.getSubstances();
   int nSubs = substances.size(); // substances.length;
   Substance s;
   for (int i = 0; i < nSubs; i++) {
     s = (Substance) (substances.get(i));
     substanceNames.addElement(s.getName());
   }
 }