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PART BY THE MAIN SHAFT, AND IN PART BY THE AFTER-SHAFT (a). 
In the first place, the fact that any of the rami of the pre-penna should be found in 
FIG. 3.—A DEVELOPING CONTOUR FEATHER OF Pygoscelis adelig, SHOWING THE MESOPTYLE DOWN-PLUMAGE BORNE IN 
organic connection with those of the after-shaft of the contour feather is, so far as I 
know at present, elsewhere unknown. 
