If the destruction of the breeding-places of Aëdes argenteus (aegypti, fasciata) is carried out too completely, it is known that some of the females lay their eggs in abnormal places in which they would never oviposit if their peace of mind had not been very greatly disturbed. Carter has advocated placing pots of water on verandahs in order that the female mosquitos may follow their sexual instincts without perversion ; at the same time no breeding takes place, as the pots are emptied, dried and refilled once a week. A drawback to this method is that it must be done by a careful, methodical person or the pots may become breeding-places and larvae will adhere to the bottom of the pot and survive.