. Dr. Evans' How to keep well; . to kill the parasiteswhich have hatched meanwhile. Thin-skinned persons should modify the above plan. LICE There are three varieties of lice which regularly live as human parasites—the head louse, the body louse and the crab louse. It has been proved that lice transmit typhus fever. Furthermore, it has beenproved that a mild form of typhus fever knownas Brills disease is present in many portions ofthe United States. We learn that the European soldiers in thetrenches pull off their clothes and leave them onant heaps as a means of ridding themselves oflice. This
. Dr. Evans' How to keep well; . to kill the parasiteswhich have hatched meanwhile. Thin-skinned persons should modify the above plan. LICE There are three varieties of lice which regularly live as human parasites—the head louse, the body louse and the crab louse. It has been proved that lice transmit typhus fever. Furthermore, it has beenproved that a mild form of typhus fever knownas Brills disease is present in many portions ofthe United States. We learn that the European soldiers in thetrenches pull off their clothes and leave them onant heaps as a means of ridding themselves oflice. This may work with body lice. It will notwork with the other two varieties. For the body lice the clothes must be baked,steamed, or washed in gasoline. Two treatmentsat intervals of a week are required. For head lice several washes are , 2 per cent carbolic acid and a tinctureof cocculus indicus are good. The treatment mustbe repeated as nits are not easily killed. Mer-curial ointment applied will kill crab Fig. 376.—Louse and Nit, BEDBUGS From the standpoint of disease, bedbugs are not important. They havebeen known to spread plague, kala-azar, trypanosoma, relapsing fever, Aleppoboil, typhoid fever, tuberculosis, and syphilis. All but the last three of thesediseases are of little importance in this portion of the world. It is not thoughtthat bedbugs are important factors in the spread of any of them. Bedbug eggs hatch in six to ten days. If the bug gets plenty of foodit reaches the adult size in thirty-five days. If poorly fed, one hundred andfifty days may be required. A bedbug can live without food for more thana year. While they prefer to bite human beings they do not hesitate to feedon cats, dogs, rats, mice, swallows, canaries, sparrows or any other acces-sible warm-blooded animals. Much the most efficient method of destroying bedbugs is by the use of hy-drocyanic gas. This method is too. dangerous to be used except by persons whohave had experien
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