VOL. vn.] PLUMAGES OF THE ROOK. 139 



Plate 7. — Fig. 19, Portion of Fig. 17, magnified 18 diam. Fig. 20, 

 Portion of feather from throat (80 mm. from angle of mandibles) 

 of First-winter Book ((J Sept. 27th, 1912), magnified 18 diam.. 



Plate 8. — Fig. 21, Plumule from amongst feathers of chin (22 mm. 

 from angle of mandibles) of First-winter Rook {^ Sept. 27th, 1912), 

 magnified 7 diam. Fig. 22, Portion of same magnified 18 diam. 



Plate 9. — Fig. 23, Degenerate feather (newly grown) from chin of 

 Adult Rook ($ Sept. 14th, 1912), magnified 7 diam. Fig. 24, 

 Portion of same magnified 18 diam. 



Plate 10. — Fig. 25, Much worn degenerate feather and a filoplume 

 from chin of Adult Rook ($ March 10th, 1913) magnified 7 diam. 

 Fig. 26, Piece of skin from chin of Adult Rook {^ October 18th, 

 1912) showing an "aborted pin," magnified 18 diam. 



Plate 11. — ^Wing of Rook {^ May 27th, 1912) showing Primaries 

 1 to 5 old (6 is dropped and 7 and 8 are growing but are not 

 far enough up to show) ; 9 and 10 new and nearly full grown. 

 Secondaries all old. Greater Coverts all moulted and growing 

 together before any of the secondaries are lost. 



