. Concerning evolution. Evolution. FIGURE NO. 17 IV DEVELOPMENT OF ANTLERS OF RED DEER In the young buck of Cervus elaphus an outgrowth or pedicle grows out from the frontal bone in the course of the first year. This pedicle is a permanent structure. In the second year (I) there grows an antler with an unbranched stem. This falls off at the end of the season. Next year—the third—the second antler (II) grows, with a stem and one branch or tine. The thickened ridge at the base shows where the antler drops off each year. A new tine is added each year, , Ill to V. No. V is an antler of the six
. Concerning evolution. Evolution. FIGURE NO. 17 IV DEVELOPMENT OF ANTLERS OF RED DEER In the young buck of Cervus elaphus an outgrowth or pedicle grows out from the frontal bone in the course of the first year. This pedicle is a permanent structure. In the second year (I) there grows an antler with an unbranched stem. This falls off at the end of the season. Next year—the third—the second antler (II) grows, with a stem and one branch or tine. The thickened ridge at the base shows where the antler drops off each year. A new tine is added each year, , Ill to V. No. V is an antler of the sixth year, with four tines. But while the figure shows individual development, it might also serve to show racial evolution, for the number of tines attained was gradually added to as the race grew older. This is shown by "rock-records" of ancestral species of deer. The individual development recapitulates racial evolution. 128. 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 Thomson, J. Arthur (John Arthur), 1861-1933; Dwight Harrington Terry Foundation. New Haven, Yale University Press; [etc. , etc. ]
Size: 1849px × 1352px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorthomsonjarthurjohnart, bookcentury1900, bookdecade1920
