. Fig. 39. Feathers showing eggs or "nits" of the common hen louse. EnLarged. (Original.) full-grown state as many as 10 or 12 molts apparently take place, there being little difference in each stage, except the gradual darkening of the markings. The eggs or nits of hen lice are shown in Fig. 39. Methods of Introduction and Infestation. — It is generally agreed that lice and other parasites flourish best in insanitary surroundings. There must, however, be a source of infesta- tion. Lice are brought to a new place by introducing in- fested birds. They spread from bird to bird (a) dire
. Fig. 39. Feathers showing eggs or "nits" of the common hen louse. EnLarged. (Original.) full-grown state as many as 10 or 12 molts apparently take place, there being little difference in each stage, except the gradual darkening of the markings. The eggs or nits of hen lice are shown in Fig. 39. Methods of Introduction and Infestation. — It is generally agreed that lice and other parasites flourish best in insanitary surroundings. There must, however, be a source of infesta- tion. Lice are brought to a new place by introducing in- fested birds. They spread from bird to bird (a) directly during copulation (an infested cock often infests the whole
Size: 2821px × 1772px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectpoultry, bookyear1915
