1 86 Wet-Fly Fishing 



the "The Scientific Angler, " by old David 

 Foster, of Ashbourne, Derbyshire. Speaking 

 of the "Olive Dun," he remarks that "It 

 makes its first appearance in February, 

 when it presents a dead, leaden colour, 

 and is known as the 'Blue Dun.' A few 

 weeks later, if the weather be genial, it is a 

 shade lighter in the body, and is then 

 termed the ' Cock- winged Dun/ By the 

 beginning of April, it is of a general olive 

 colour, with a yellow ribbed body. It is 

 then known as the c Yellow Dun ' of April. 

 In April, in the cold water close to springs 

 or to the sources of streams, the fly appears 

 of a light blue tint, and is designated the 

 4 Pale Blue Dun,' and, in a few weeks 

 later, the ' Blue Dun ' of February appears 

 as the c Yellow Dun ' of May. In cold 

 weather, however, it appears as the ' Hares- 

 Bar Dun.' " 



The " Yellow Dun " continues to be 

 plentiful through June, the action of the 

 sun's rays rendering it lighter in the body. 

 In July it is called the "Pale Evening 

 White," and then, he goes on to add, that 

 the weather causes the selfsame insect so 

 to change its colour, that it is known now 

 as the " Common Yellow Dun," and again 

 as the " Golden Dun," and he affirms that 



