The poem opens with some rich description of a swampy area where flax ( a kind of plant ) grow. Heaney describes the flies buzzing and how the sun beats down on the mucky soil. He pays particular attention to the slimy frog spawns. This spark is a memory for the speaker. And begins to talk about how in school, his teachers had student collecting frog spawns in jars to watch it turn to tadpoles aa parts of science lesson on frogs. Then the speaker follows the sound of croaking frogs. When he sees that they are croaking and slapping in the flax dam. He is grossed out and runs away