Larry's passionate monologue about the evil creatures in the Durrell house shows once again that he finds nature as a whole to be totally in opposition to civilized human life. When Mother then tries to change the subject, it suggests, for one, that she doesn't feel the same and further, that she recognizes that guests might also not share Larry's distaste for the natural world. This leaves it open to the possibility that more people agree with Gerry than he realizes.