Why isn't my homebrew bubbling?

I am using the Cooper's Bavarian Lager kit, which includes a malt powder rather than sugar, and am maintaining a temperature around 70 degrees. I am into the fourth day now and have seen no bubbling through the airlock. I have checked the vat for air leaks and don't seem to find any. I have read that the... show more I am using the Cooper's Bavarian Lager kit, which includes a malt powder rather than sugar, and am maintaining a temperature around 70 degrees. I am into the fourth day now and have seen no bubbling through the airlock. I have checked the vat for air leaks and don't seem to find any. I have read that the fermentation takes longer with this particular brew, but should I be alarmed that it has not started as yet?
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