Plate Vlll., Fig. 4, with magnification of 150 times, shows an example of 

 this fringed edge. 



The Grey Partridge has on the inner vane a tegmen with a smooth edge, 

 and on the outer vane a ventral ridge more or less fringed. 



Plate VIII., Fig. 5, with magnification of 150 times, is given as a sample 

 of this type of fringe. 



The Grouse outer vane has a tegmen with a trace of fringe here and there. 

 The Pheasant outer vane has a ventral ridge with rough edge and irregularly 

 fringed. The Blackcock outer vane has a tegmen with light fringe commencing 

 about half-way from the base. The Capercaillie outer vane has a tegmen with 

 rough edge, with very little trace of fringe. 



The presence of tegmen is not restricted to the primaries, for I find it on the 

 tail'feathers of the Grouse and Blackcock, while in the Capercaillie it is most 

 marked. It does not appear on the tail-feathers of the Pheasant, Grey Partridge, 

 or Red-legged Partridge. 



Plate IX., Fig. 1, was made to show the difference in structure between the 

 Barb and Tegmen. The dark mottled portion is barb, and the lower and lighter 

 portion is tegmen. This subject was made from a barb cut from a Pink-footed 

 Goose Primary, with magnification of 50 times. 



Plate IX., Fig. 2, is an attempt to show the superficial structure of the 

 Tegmen of a Pink- footed Goose. It was made with a magnification of 500 times. 



The photographic work through the microscope was done 

 with daylight as the illuminant. A certain amount of detail 

 has been lost in reproduction, but this was inevitable. 



