Download or read book Ecdysis, As Morphological Evidence of the Original Tetradactyle Feathering of the Bird's Fore-Limb; Based Especially on the Perennial Moult in Gymnorh written by Edward Degen and published by Rarebooksclub.com. This book was released on 2013-09 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...from the skin. This arrangement gives it the appearance of a continuous growth for the whole series, and therefore produces the delusion referred to before. Fortunately, among the specimens procured to supply data for the various stages, No. 15 provides us with the desired information on the subject, where medece inferiores 1, 2, and 3 of the inner area, and 7, 8, 9, and 10, belonging to the outer one, are in course of renewal. That it is not a merely accidental circumstance, but a reliable case, is further evidenced by the perfect symmetry of the occurrence on both wings. The relative position for the renewal of the ventral series in the juv., specimen 15, to their dorsal congeners (see diagram of Table V. fig. 5) can be adequately formulated thus: --Metacarpo-dujital Portion. Left wing. Right wing. Distal area. Proximal area. Proximal area. Distal area. Dorsal series... 10, 9, 8, 7, 4, 3, 2, 1 1, 2, 3, (4), (5), --7, 8, 9, 10 Ventral series... 10, 9, 8, 7, 3, 2, 1 1, 2, 3, 7, 8, 9, 10 The symbol o, placed above figures 4 and 5 of the coverts of the dorsal series of the right side, denotes that these feathers were recently shed, thus showing the relative movement for the different constituents of this row to be in nearly perfect synchronism within the two areas; whereas for the left wing the 4th covert of the dorsal row, having been replaced already, constitutes a case of retardation for the proximal area, the old covert 5 being still retained. However, individuals older by a season or two acquire perfect conditions of synchronism for the dorsal and ventral rows within the same area, and a highly instructive example of this is seen in the old male No. 10 (see also Table V. fig. 6), which, moreover, shows the connection of the moult between.