I would fill jampotfuls of the jellied
Specks to range on window-sills at home,

from Seamus Heaney – Death of A Naturalist on Rap Genius

Meaning

The speaker would take some of the frogspawn and put them in a jar on the windowsill so he could watch them grow. He’s a budding “naturalist,” innocently curious about these strange live things.

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