No "launcher icon size slider" in Appearance

[Gregor Shapiro]

Trying to change the size of the Launcher icons I am directed to use "the Launcer size slider" in the Appearance application. There is no such slider that I can find.
Please include information in the Help for those of us who are in my situation.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubuntu-docs 12.04.6
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic-pae 3.2.30
Uname: Linux 3.2.0-32-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu14
Architecture: i386
Date: Sat Oct 27 11:20:07 2012
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-docs
UpgradeStatus: Upgraded to precise on 2012-07-15 (104 days ago)

[Gregor Shapiro (gregor-shapiro)]

How go I change the appearance of my 12.04 desktop? I want to make my Launcher icons smaller (I have no slider in my Appearance app that is supposed to do the trick).