Author to Her Book
... The speaker refers to her book that she ahs written to an "ill-formed offspring of my feeble brain." This sets off the feeling of ownership from the author towards her book. ... When a new child is born everyone wants to hold and touch it, just like they are wanting to touch and read her book. ... The press is goign to make the same judgements about the speakers book. "I cast thee by as one unfit for light" shows how the author has taken stuff the press and her friends have said to heart and wants to erase the book away.