UNIFORMITY IN SETTING. 



271 



from the uncovered base ; a pin can be inserted below the fore 

 wing while the hind wing is being brought into position, but 



FIC. 2. 



TRACING CLOTH 



when this has been done and another pin inserted to keep it in 

 place, as shown in the diagram, the first pin can be removed ; 

 additional pins are required to keep the legs and antennae in 

 place, and sometimes to hold up the body. To set the next 

 specimen all that is required is to turn back the tracing cloth 

 and repeat the process. Now the important point of uniformity 

 in the position of the wings is, I believe, only to be arrived at in 

 one way, that is, to draw an imaginary line following the inner 

 margins of the fore wings and passing through the pin in the 

 thorax, as shown in fig. 3, a, a. This will be found to produce the 

 best results in the majority of Lepidoptera. 



I may mention in conclusion that setting-boards should on 

 no account be covered with papered cork, as the pin-holes leave 

 a roughness which is a disadvantage in raising the wings into 

 place. Before using the tracing cloth a second time, it should 



y2 



