. FIG. l6—A HOG LOUSE AND HAIR WITH EGGS ATTACHED free end, the lid of which is forced open by the young louse when it is ready to leave the egg. The period of hatching is probably from one to three weeks. Source of Infection.—This pest is widely dis- tributed. Hogs become infested by coming in con- tact with lousy hogs, or when kept in pens and hog houses that have been occupied by such ani-

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906