Catherine suffered serious physical injuries in an automobile accident and became acutely depressed as a result. One morning, she received a check for $17,400 in settlement of her claims arising out of the accident. She indorsed the check and placed it on the kitchen table. She then called Robert, her longtime roommate, to tell him the check had arrived. That afternoon, she jumped from the roof of her apartment building, killing herself. The police found the check and a note from her, stating that she was giving it to Robert. Had Catherine negotiated the check to Robert?