How to find Palettes in Mathematica?

How do I get to a Palette that's 开发者_高级运维not in my "Palettes" menu? For instance, I occasionally need "Notation" palette, and it's not in that menu

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I'm running Mathematica 8 on Mac OS X.

From the main menu select Palettes | Install Palette ... In the dialog box choose Source then From File.... I found the Notation palette in /Applications/Mathematica.app/AddOns/Packages/Notation/LocalPalettes/English/. Once you've done this the NotationPalette should be installed on the menu for future use.