Double-Mouse-1 doesn't do selection

Question

When I do a double click, I don't see any selection. Is there anything I need to enable to make it work? Other mouse functionalities work fine. See http://www.gnu.org/software/emacs/manual/html_node/emacs/Word-and-Line-Mouse.html

Here is my mouse configuration

;; Enable mouse support
  (require 'mouse)
  (xterm-mouse-mode t)
  (global-set-key [mouse-4] (lambda ()
                              (interactive)
                              (scroll-down 1)))
  (global-set-key [mouse-5] (lambda ()
                              (interactive)
                              (scroll-up 1)))
  (defun track-mouse (e))

Thanks

EDIT: I use emacs through a terminal: I ssh from ubuntu terminal to a remote machine and run emacs -nw on the remote machine.