. Clé d'oiseaux d'Amérique du Nord ; contenant des indications succinctes sur chaque espèce d'oiseau vivant et fossile connu à l'heure actuelle du continent au nord de la frontière du Mexique et des États-Unis. Illustré par 6 plaques d'acier et plus de 250 gravures sur bois. Les oiseaux. Fig. 2. Sections d'une ri^feallier id centrale de la Lyre- bird. La taille naturelle ;" a, à partir de la courbe terminale ; 6, partie du milieu. 8), et des livrets {hamuli ; pi. i, fig. 8). Ce sont simplement une sorte de frange à la barbules, exactement comme si le bord inférieur de la barbule étaient effilochée et seules diffèrent les uns des autres dans l'un son franc, d'un sèche-comme proces

• Contributeur: Central Historic Books / Alamy Banque D'Images
• ID de l’image: PFYXBT
• Taille du fichier: 7,1 MB (182,7 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1577 x 1584 px | 26,7 x 26,8 cm | 10,5 x 10,6 inches | 150dpi

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. Key to North American birds; containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary. Illustrated by 6 steel plates and upwards of 250 woodcuts. Birds. Fig. 2. Sections of a central ri^id feallier of the Lyre- bird. Natural size;" a, from terminal curve; 6, middle portion. 8), and booklets {hamuli; pi. i, fig. 8). These are simply a sort of fringe to the barbules, just as if the lower edge of the barbule were frayed out, and only differ from each other in one being plain, hair-like processes, and the other being hooked at the end. Barbicels do occur on both anterior and pos- terior rows of barbules; but rarely on the latter; booklets are confined to barbules of the anterior series, which, as we have seen, overlie the posterior rows of barbules, diagonally forming a meshwork. The beautiful design of this structure is evident; by it, the barbules are in(e7'locked, and the vane of the feather made a web; for each booklet of one barbule catches hold of a barbide from the next barb in front, — any barbule thus holding on to as many of the bar- bules of the next barb as it has booklets. To facilitate this interlocking, the bar- bules have a thickened upper edge of such size that the booklets can just grasp it. This is clear- ly illustrated in pi. i. fig. 2, where a, a, a, a are four barbs in transverse section, viewed from the cut surfaces; with their anterior (b, b, b, b), and posterior (c, c, c, c) barbules, the former bearing the booklets which catch over the edge of the latter. b. But all feathers do not answer the above description. First, the after-shaft may be wanting, as we have seen ; then, as frequently happens, booklets may not be developed, and barbicels may be few or wanting; barbules may be few or wanting, or so trans- formed as to be only recognized by position, and even barbs themselves may be wanting on one side of the shaft, as in some tail feathe

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• bookcentury1800
• bookdecade1870
• booksubjectbirds
• bookyear1872