14 THE LO-BAS. 



In preference the Bas should be constructed on rocky or 

 hard ground, that the beast may not burrow beneath the 

 walls ; and the trouble of making a floor is thereby avoided. 

 It is rectangular in form. Three of its sides are built 

 up of squared blocks of wood, whilst the fourth is open 

 for the admittance of the lynx. But the drop the 

 after-part of which rests on the closed end of the Bas 

 is of sufficient length, when down, as entirely to close the 

 entrance. 



Fig. 1 shows the ground plan of the Bas ; A A A the first 

 layer of blocks, B the threshold, c c c c the holes at the end 

 of the threshold for the reception of the upright poles, 

 between which the side walls are built up ; the two outer- 

 most of which should be somewhat longer than the rest, and 

 provided at the top with a sort of crutch, as seen in Fig. 2, 

 for the reception of the roller E, on which the lever F 

 rests. 



Fig. 3 shows the drop itself; G, a pin connecting the outer 

 ends of the blocks of which it is formed ; and H the cross- 

 piece whereby it is attached to the ,Bas. 



Fig. 2 represents a side view of the Bas when gillrad, as 

 also the manner in which the drop D acts namely, by secur- 

 ing together with withers the pole n (placed crosswise in the 

 hemispheric hinge-like depression in the drop), and the end 

 of the upper stock forming the gable end. 



Fig. 4 : the Gillring as seen in front, in section, and as 

 shown by the line A B, in Fig. 2. 1 1 are two pins inserted in 

 one of the side walls. K, the Giller-pin, which is about five 

 inches in length, securely fastened by the middle to the line 

 N, appended to the lever F, as shown in Figs. 2 and 5. The 

 upper end of K is placed under and against the uppermost pin 



