I have a with id `#list` and on click of some button I want to increase the size of all list elements by `50px`.

Why does the following code doesn't work: 

```
function Test(){
   $("#list li").each(function(){
       var h = this.height() + 50;
       this.height(h);
   });
}

```

This function is activated on button click and on click I get the following error:  

```
Uncaught TypeError: Object #<HTMLLIElement> has no method 'height' index.html:32
(anonymous function) index.html:32
b.extend.each jquery-1.9.1.min.js:152
b.fn.b.each jquery-1.9.1.min.js:45
Test index.html:31
onclick index.html:44

```