Coolant. Does it smells sweet? Then it's coolant, there's a drain plug in the middle of the block along the bottom, see if it's leaking from that, there could be a bad gasket in it. Or it could be leaking from one of the hoses and dripping down the block,
It's more likely the coolant is leaking from an old hose, make sure you inspect them.
Kevin (President TBEA)
"WAAAAAAARRRRRIORS, come out to plaaaaay."