diff --git a/src/layout/iter.rs b/src/layout/iter.rs
index e1cb3d9..bd80aae 100644
--- a/src/layout/iter.rs
+++ b/src/layout/iter.rs
@@ -43,10 +43,23 @@ pub fn iter_east_fixed <'a, S: Screen, D: 'a, I: Iterator<Item = D>, U: Draw<S>>
     draw(move|_to: &mut S|{ todo!() })
 }
 
-pub fn iter_south <'a, S: Screen, D: 'a, I: Iterator<Item = D>, U: Draw<S>> (
-    _iter: impl Fn()->I, _draw: impl Fn(D, usize)->U,
+pub fn iter_south <'a, S: Screen, D: Draw<S>, I: Iterator<Item = D>> (
+    iter: impl Fn()->I
 ) -> impl Draw<S> {
-    draw(move|_to: &mut S|{ todo!() })
+    draw(move|to: &mut S|{
+        let XYWH(x, mut y, w, mut h) = to.area();
+        let h0 = h;
+        for item in iter() {
+            if let Some(used) = to.draw(Some(XYWH(x, y, w, h)), item)? {
+                y = y.add(used.y());
+                h = h.minus(used.y());
+                if h == S::Unit::zero() {
+                    break;
+                }
+            }
+        }
+        Ok(Some(XYWH(x, y, w, h)))
+    })
 }
 
 pub fn iter_south_fixed <'a, S: Screen, D: 'a, I: Iterator<Item = D>, U: Draw<S>> (