The variation of animals and plants under domestication . was considerablymore prominent than in the rock-pigeon. In the lower jaw, the articular surface is proportionally smallerin many breeds than in the rock-pigeon: and the vertical diameter,more especially of the outer part of the articular surface, is con-siderably shorter. INIay not this be accounted for by the lesseneduse of the jaws, owing to nutritious food having been given duringa long period to all highly improved pigeons? In Runts, Carriers,and Barbs (and in a lesser degree in several breeds), the wholeside of the jaw near the art
The variation of animals and plants under domestication . was considerablymore prominent than in the rock-pigeon. In the lower jaw, the articular surface is proportionally smallerin many breeds than in the rock-pigeon: and the vertical diameter,more especially of the outer part of the articular surface, is con-siderably shorter. INIay not this be accounted for by the lesseneduse of the jaws, owing to nutritious food having been given duringa long period to all highly improved pigeons? In Runts, Carriers,and Barbs (and in a lesser degree in several breeds), the wholeside of the jaw near the articular end is bent inwards in a highlyremarkable manner: and the superior margin of the ramus, be-yond the middle, is reflexed in an equally remarkable manner, asmay be seen in the accompanying figures, in comparison with the Chap. V. OSTEOLOGICAL DIFFERENCES. 109 jaw of the rock-pigeon. This reflection of the upper margin ofthe lower jaw is plainly connected with the singuhirly wide gapeof the mouth, as has been described in Hunts, Carriers, and
Size: 2443px × 1023px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectdomesti, bookyear1900
