Because it's not in the rules.
Really, that's the only reason. I guess that they thought that no self-respecting druid would learn the destructive magic of a mage. Other than that, no real reason.
That's why I like 3rd edition; no restrictions on race and/or class combinations.
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[img]\"ubb/noncgi/smiles/new/ghoul.gif\" alt=\" - \" /><br /><br />\"The middle class pays all of the taxes, does all of the work.<br />The lower class exists just to scare the middle class.\"<br />-George Carlin
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