Journal of experimental zoology . 505 PLATE 6 EXPLAXATIOX OF FIGURES 46 Lesser wing covert from blue bird. Ouh the distal third of the feather isblue, which fades to dun in the proximal portion. 47 Secondary covert from blue bird. Black spot is on exposed portion offeather. A row of such spots make up the black bar. a feature of the blue pat-tern. Shows the downy tissue found at base of such feathers. 48 Portion of ridge of feather germ from blue bird (1028 .1) cut through thedun region. No spherical granules are present (fig. 44). X 430. 49 Ridge from blue feather in region intermediate betwe
Journal of experimental zoology . 505 PLATE 6 EXPLAXATIOX OF FIGURES 46 Lesser wing covert from blue bird. Ouh the distal third of the feather isblue, which fades to dun in the proximal portion. 47 Secondary covert from blue bird. Black spot is on exposed portion offeather. A row of such spots make up the black bar. a feature of the blue pat-tern. Shows the downy tissue found at base of such feathers. 48 Portion of ridge of feather germ from blue bird (1028 .1) cut through thedun region. No spherical granules are present (fig. 44). X 430. 49 Ridge from blue feather in region intermediate between blue and dun,showing lack of specificity of the tissue—all shapes and sizes of granules arepresent simultaneous!} in one ridge. X 800. 50 Two contiguous pigment cells in a blue feather fundament, from regionnear figure 49. X 640. 51 to 53 Sections from blue feather fundaments showing progressive stagesin the clumping of tlie pigment. 51 The barbule cells have begun to elongate; the pigment is spread prorais-cuouslj- througho
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
