First of all, your selector is overkill. I suggest using a class or ID selector like my example below. Once you've corrected your selector, simply use jQuery's .each() to iterate through the collection:

ID Selector:

$('#mytable td').each(function() {

    var cellText = $(this).html();    

});

Class Selector:

$('.myTableClass td').each(function() {

    var cellText = $(this).html();    

});

Additional Information:

Take a look at jQuery's selector docs.