It indicates that Huck frequents places perhaps grocery stores where the conditions are not sanitary what with "sickly eggs and rotten cabbages and dead cats" in other words, Huck cannot afford to frequent fancier shops or fancier homes because he is poverty stricken and used to such sights.
Tomorrow I have to walk the dog, write an essay, and mail a letter. This example illustrates the proper use of parallel structure
