. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. G8 Miscellaneous. stinctly beaded appearance when examined by a simple lens. Under the microscope, with a moderate power, this beaded aspect is lost, and the barbule appears merely divided by faint transverse partitions into a series of cells, some of which, towards the apex, exhibit small tooth-like projections representing the rudiments of barbicels (fig. 3). All tbe barbs remaining on the feathers appear to be Fig. 1. The basal portion of a feather detached from
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. G8 Miscellaneous. stinctly beaded appearance when examined by a simple lens. Under the microscope, with a moderate power, this beaded aspect is lost, and the barbule appears merely divided by faint transverse partitions into a series of cells, some of which, towards the apex, exhibit small tooth-like projections representing the rudiments of barbicels (fig. 3). All tbe barbs remaining on the feathers appear to be Fig. 1. The basal portion of a feather detached from the skin, of the natural size : a. The accessory shaft. 2. Part of a barb with the barbules ; magnified 15 diameters. 3. Apical portion of a barbule ; magnified 150 diameters. The barbs of the accessory plume are of the same general struc- ture as those on the main shaft, but they appear to form a single series on each side from the base. The barbs nearest the base of the feather, both in the main web and the accessory plume, are destitute of barbules for some distance from their base ; but this distance gradually decreases until the barb is furnished with barbules throughout its whole length. It is evidently impossible to determine from these mere fragments of feathers what was the precise structure of those organs when per- fect ; we cannot even decide whether the basal barbs possessed the. 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 London, Taylor and Francis, Ltd
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Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
