ENTOMOLOGY

LICE WHICH AFFECT DOMESTIC ANIMALS 343{owl, there is absolutely no reason why lice should not be completely eradicatedfrom a flock. Of course to accomplish this every bird must betreated at about the same time. All that is necessary to maintain alouse-free condition is not to allow infested fowls to come in contact withthe clean flock.It has been found that a thorough application of flowers of sulphurwill destroy all lice, but since a much larger amount is necessary theexpense of treatment is greater than when sodium fluoride is used andthere are also said to be some deleterious effects from the free use ofsulphur although this has not been observed by the writer. Mercurialointment or blue ointment is extensively used against lice. If applied asgenerally recommended it will not accomplish the complete destruction ofthe lice present and repeated applications are necessary to keep themin check, which would be expensiv(!. There is also some danger of producingmercurial poisoning by the free use of this material. The socalled"Cornell Powder," consisting of a mixture of carbolic acid, gasolineand plaster of Paris, is quite effective, but as the eggs of the lice arenot destroyed two or more applications are necessary to accomplish whatcan be done with one application of sodium fluoride and the trouble ofmixing the material is considerable.For the treatment of pigeons it is advisable to dip them individuallyin sodium fluoride solution made as above described but with the additionof one ounce of laundry soap to each gallon of water in order to increasethe ~etting power. The squabs must also be treated.Turkeys may be treated precisely as arc chickens, either by the pinchor dipping methods. The large birds should receive abo,ut eighteenpinches of powder and of course a large tub is necessary for properdipping.It is recommended for exterminating lice from a flock, that the treatmentbe given if convenient in the late summer aft~r the young chickenshave matured and the flock ,has been culled and reduced to a minimum.Of course if lice are present there is no objection to treating at any timeduring the year and the quicker the treatment can be given the better.As poultrymen generally recommend hatching of chicks early in thespring this tends to reduce the loss from lice and other poultry parasites,but of course this should not be depended upon when so simple a methodas the sodium fluoride treatment is available.LICE INFESTING RABBITS, CATS AND DOGSDomestic rabbits are not infrequently infested with an elongate, bluesucking louse. They seem occasionally to become sufficiently numerous,especially on young rabbits, to retard growth and reduce vitality. The