in his first collections heaney is fascinated with the soil as he can perceive a mysterious life force in it. He uses many words to refer to it: slime, muck, mush. All of them describe a soil that is wetting and become less solid: this is a metaphor for sexual life, where the soil is the female element responding to a male one.
The Tollund Man
Some day I will go to Aarhus To see his peat-brown head, The mild pods of his eye-lids, His pointed skin cap.
In the flat country near by Where they dug him out,