W.G. Russell M.V.Z., Berkeley, Calif. Feb. 13, 1960 Catching the one in the can trap last night raised my hopes that maybe now these traps would work. No such luck this morning they were plugged or by-passed as usual. Am now convinced that no trap which requires a disturbance of the burrow is going to be effective. Any disturbance of the burrow usually causes the mole to start pushing dirt or digging an new burrow. The only idea I have at the moment for a trap goes something like this. End view of opened burrow: Trap must be some type that can gobble up dirt, mole & all of a piece of original burrow that has been exposed in above manner. This takes power to drive metal through the ---- base of undisturbed earth.