diff --git a/ChangeLog b/ChangeLog
index 5c85a33392..82b4cc4d96 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Jun  3 15:00:22 2008  Akinori MUSHA  <knu@iDaemons.org>
+
+	* lib/set.rb (Set#collect, Set#select): Back out.  I thought it
+	  was consistent but turned out to be wrong.
+
 Tue Jun  3 13:41:08 2008  Akinori MUSHA  <knu@iDaemons.org>
 
 	* lib/set.rb (Set#collect, Set#select): Override Enumerable
diff --git a/lib/set.rb b/lib/set.rb
index f73aceabbc..662b698b4e 100644
--- a/lib/set.rb
+++ b/lib/set.rb
@@ -255,32 +255,13 @@ class Set
     self
   end
 
-  # Calls the given block once for each element and returns a new set
-  # containing the values returned by the block.
-  def collect
-    block_given? or return enum_for(__method__)
-    set = self.class.new
-    each { |o| set << yield(o) }
-  end
-  alias map collect
-
-  # Replaces the values with ones returned by collect().
+  # Replaces the elements with ones returned by collect().
   def collect!
     block_given? or return enum_for(__method__)
     replace(collect)
   end
   alias map! collect!
 
-  # Calls the given block once for each element and returns a new set
-  # containing those elements for which the block returns a true
-  # value.
-  def select
-    block_given? or return enum_for(__method__)
-    set = self.class.new
-    each { |o| set << o if yield(o) }
-    set
-  end
-
   # Equivalent to Set#delete_if, but returns nil if no changes were
   # made.
   def reject!