A captured marmennil (merman) laughs thrice, and when pressed, reveals to the peasant his insight (buried gold, wife's infidelity, dog's fidelity) on promise of release. The peasant finds wonderful gray milk-cows next to his property, which he presumes were the merman's gift; the unruly cows were made obedient by bursting the strange bladder or sac on their muzzle (with the stick he carried)