This can, however, be departed from in every respect, and often the bars 
show a most haphazard character in the number and extent of thei 
formation. Sometimes they extend entirel 
y across the plume, involving 
also the shaft in the middle, while again they may pass only part way 
across the flue, or may be practically limited to one side: further, 
BulGhe 
A strongly barred plume showing breakages of the flue where the bars oceur. 
although always narrow, the individual bar may be strongly or faintly 
indicated, and all stages occur between the extremes. 
As regards the separate feathers on an ostrich, these also vary 
greatly in the degree to which they are affected. Some birds will have 
almost the entire plumage barred, the wing feathers, tails, and body- 
feathers, while in others only a few plumes will show the imperfection. 
