. Beginners zoology. Zoology. by pressing together the two sides of a spHt in the vane ? Does the web separate at the same place when pulled until ^ it splits again ? The hollow part of the shaft of a quill feather is called the qui//. The part of the shaft bearing the vane is called the racliis (ra-kis). The vane consists of slender /)arbs which are branches of the shaft (II, Fig. 292). As the name indicates (see dictionary), a barb resembles a hair. The barbs in turn bear second- ary branches called bar- bides, and these again have shorter branches called bar- bicels (III, Fig. 292). These a
. Beginners zoology. Zoology. by pressing together the two sides of a spHt in the vane ? Does the web separate at the same place when pulled until ^ it splits again ? The hollow part of the shaft of a quill feather is called the qui//. The part of the shaft bearing the vane is called the racliis (ra-kis). The vane consists of slender /)arbs which are branches of the shaft (II, Fig. 292). As the name indicates (see dictionary), a barb resembles a hair. The barbs in turn bear second- ary branches called bar- bides, and these again have shorter branches called bar- bicels (III, Fig. 292). These are sometimes bent in the form of booklets (Fig. 292, III), and the booklets of neighbouring barbules interlock, giv- ing firmness to the vane. When two barbules are split apart, and then re- united by stroking the vane between the thumb and the finger, the union may be so strong that a pull upon the vane will cause it to split in a new place next time. There are four kinds of feathers, (i) the qui/l feathers, just studied; (2) the co7itoiir feathers (I, Fig. 292), which form the general surface of the body and give it its outlines; (3) the doivny feathers (Fig. 293), abundant on Fig. 292.— I, Contour Feather. II, III, Parts of Quill Feather, Fig. 293.— A Down Feather, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coleman, Walter M. Toronto : Macmillan
Size: 1344px × 1859px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
