why is jQuery selector property undefined within each()?
<p>Given the following code, why does the selector property work in the first instance but not the second?  Aren't they both jQuery objects?</p>

<pre><code>&lt;span class='tst'&gt;span&lt;/span&gt;​

var tst = $('.tst');
console.log(tst.selector); 
// prints '.tst'

$('.tst').each(function() { console.log(this.selector);});
// prints undefined​​​​​​​
</code></pre>
