what is catherine's testimony?

Can you let me know what chapter this is in? Most likely what this is referring to is Catherine's testimony to the inquest or the police when they are trying to piece together how Mrs. Wilson (Catherine's sister) died. She would have some knowledge of Tom and by extension, Daisy, because of her sister's affair with the former and their frequent visits to NYC. But let me know which chapter, and I can help more specifically.