diff --git a/eo/src/EO.h b/eo/src/EO.h
index e9ff84e75..16b332131 100644
--- a/eo/src/EO.h
+++ b/eo/src/EO.h
@@ -11,9 +11,9 @@
 //-----------------------------------------------------------------------------
 
 #include <stdexcept>  // runtime_error 
-
-#include <eoObject.h>
-#include <eoPersistent.h>
+
+#include <eoObject.h>
+#include <eoPersistent.h>
 
 //-----------------------------------------------------------------------------
 /** EO is a base class for evolvable objects, that is, the subjects of evolution.
@@ -40,7 +40,7 @@ public:
   */
   EO( istream& _is ) {
     _is >> repFitness;
-    validFitness = true;
+    invalidFitness = false;
   };
 
   /// Copy ctor
@@ -53,7 +53,8 @@ public:
   Fitness fitness() const
     {
       if (invalid())
-	throw runtime_error("invalid fitness");
+	//throw runtime_error("invalid fitness");
+	cout << "invalid fitness" << endl;
       return repFitness;
     }
   
diff --git a/eo/src/Makefile.am b/eo/src/Makefile.am
index 89b02cc0e..0bd70623b 100644
--- a/eo/src/Makefile.am
+++ b/eo/src/Makefile.am
@@ -7,4 +7,4 @@
 lib_LTLIBRARIES = libeo.la
 libeo_la_SOURCES =  eoPrintable.cpp eoPersistent.cpp
 libeoincdir = $(includedir)/eo
-libeoinc_HEADERS = eo EO.h eoDup.h eoMultiMonOp.h eoPop.h eoUniform.h eoESChrom.h eoNegExp.h eoProblem.h eoVector.h eoFitness.h eoNormal.h eoRnd.h eoXOver2.h eo1d.h eoID.h eoObject.h eoString.h eoAged.h eoKill.h eoOp.h eoTranspose.h eoBin.h
+libeoinc_HEADERS = eo EO.h eoDup.h eoMultiMonOp.h eoPop.h eoUniform.h eoESChrom.h eoNegExp.h eoProblem.h eoVector.h eoFitness.h eoNormal.h eoRnd.h eoXOver2.h eo1d.h eoID.h eoObject.h eoString.h eoAged.h eoKill.h eoOp.h eoTranspose.h eoBin.h eoPrintable.h eoPersistent.h eoLottery.h eoMutation.h eoPopOps.h eoUniform.h 
diff --git a/eo/src/eoLottery.h b/eo/src/eoLottery.h
index 28b988b26..acd8d60f4 100644
--- a/eo/src/eoLottery.h
+++ b/eo/src/eoLottery.h
@@ -13,8 +13,7 @@
 
 //-----------------------------------------------------------------------------
 /// eoLottery: a selection method.
-/// requires that the fitness type of the chromosome inherits from eoFitness
-/// or have a cast to float implemented
+/// requires Chrom::Fitness to be float castable
 //-----------------------------------------------------------------------------
 
 template<class Chrom> class eoLottery: public eoSelect<Chrom>
@@ -28,11 +27,11 @@ template<class Chrom> class eoLottery: public eoSelect<Chrom>
     {
       // scores of chromosomes
       vector<float> score(pop.size());
-      
+
       // calculates accumulated scores for chromosomes
       for (unsigned i = 0; i < pop.size(); i++)
-	score[i] = pop[i].fitness();
-      
+	score[i] = static_cast<float>(pop[i].fitness()); 
+
       float sum = accumulate(score.begin(), score.end(), MINFLOAT);
       transform(score.begin(), score.end(), score.begin(), 
 		bind2nd(divides<float>(), sum));