The third person he met on his travels was a buxom scullery wench.  

"Excuse me miss" said Meyn, "but I have always relied on the kindness of strangers, and I am searching for some mother's milk. Could you help me please?" 

"Well," said the buxom scullery wench, "I have not yet had children, but you could still try suckling on my breasts." So Meyn suckled and suckled but nothing at all came out!