| Show PEST SPREAD BY MOSQUITO have traced cauce of oia that ha long been alent in tho tropics ona of the most peculiar of all dig stasea Is common in the trop aca in the blood of person buffering from it there are found innumerable little worms that can be seen only by the aid of a microscope these are present only at night in the blood that la circulating at about fire in the afternoon they begin to appear in the blood having been hidden away in the body until time and then they remain in the circulation until about midnight when they begin to diminish by eight or alna 0 clock in the morning they have all disappeared and a search of the blood under the microscope after this foils to reveal any they are now collected in certain large blood vessels deep in the body especially in the lungs where they remain hidden until they go out on their next nocturnal edcur blon the parasite Is conveyed to human beings by the bite of certain kinds of mosquitoes the mosquito bites and takes from a man or from some animal as the case may be blood which contains these small worms in the stomach of the mosquito the intermediate host the parasite goes through certain definite changes or metamorphoses which are just as necessary to its complete life as are the different phases tn the lives of butterflies moths and a great many insects first it escapes from a eken or shell in which it has existed then it bores its way through the wall of the mos kultos stomach and travels forward through the body until it arrives at the base of the bill or proboscis |
