Image d'archive à partir de la page 365 de la cyclopaedia de l'anatomie et. La cyclopaedia de l'anatomie et physiologie cyclopdiaofana01todd Année : 1836 -e Section de l'arbre et Vane agrandie. Les ardillons sont fixés sur les côtés de l'arbre près de la surface externe, et se composent de lame, comme variable à l'épaisseur, la largeur et longueur. Elles sont organisées avec leurs côtés plats l'un vers l'autre, et leurs marges dans la direction de l'interne et externe et d'autre de la plume ; par conséquent, ils présentent un con- siderable résistance à être refoulées hors de leur avion, bien qu'aisément céder à toute forc

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Archive image from page 365 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 -e Section of the Shaft and Vane magnified. The barbs are attached to the sides of the shaft near the external surface, and consist of lamina, varying as to thickness, breadth, and length. They are arranged with their flat sides towards each other, and their margins in the direction of the external and internal sides of the feather; consequently they present a con- siderable resistance to being bent out of their plane, although readily yielding to any force acting upon them in the line of the stem : e e, fig. 178, are the bases of the barbs of a feather magnified. The barbules (ff, fig. 178) are given off from either side of the barbs, and are sometimes similarly barbed themselves, as may be seen in the barbules of the great feathers of the Peacock's tail. Sometimes, as in these feathers and in the plumes of the Ostrich, the barbules are long and loose ; but more commonly they are short and close-set, and by their form and disposition constitute the mechanism by which the barbs are united together. The barbules arising from the upper side of the barb, or that next the extremity of the feather, are curved downwards or towards the internal surface of the shaft; those which arise from the under side of the barb are curved in the contrary direction: so that the two adjoining series of hooked barbules lock into one another in a manner which the Pari- sian dissectors compare to the fastening of a latch of a door into the catch of the door-post. But besides the parts which constitute the perfect feather, there is also an appendage attached to the upper umbilicus of the quill which requires to be noticed. This is termed the accessory plume. It is usually a small downy tuft, but varies both in different species, and even in the feathers of different parts of the body of the same bird. In the quill- feathers of the wings and tail, it us

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