var $es = [];
var findLeaves = function(i, $root) {
  console.log($root);
  $children = $root.children();
  if($children.length > 0) {
    $children.each(findLeaves);
  }
  else {
    $es.push($root);
  }
}
var rr = jQuery('#section-summary');
findLeaves(0, rr);