What is the purpose of beginning the text with an anecdote then moving to
the scientific and historical information?

Which line in this excerpt from "the love song of j. alfred prufrock" by t. s. eliot uses synecdoche? shall i say, i have gone at dusk through narrow streets and watched the smoke that rises from the pipes of lonely men in shirt-sleeves, leaning out of windows? i should have been a pair of ragged claws scuttling across the floors of silent seas.