MEANS FOR ARRESTING THE PROGRESS OF 



that the insect, once in, cannot get out again. The opening at the top 

 is below the level of the sides (fig. 5), and 

 not one insect in a thousand has sense enough 

 to fly up in a perpendicular line : they con- 

 stantly struggle to the highest point, and 

 after a few attempts get their wings wetted, 

 and perish. The bottle should be emptied 

 daily, the liquor being passed through a 

 sieve and saved, and the insects burned. 



The side-opening is for emptying the con- 

 tents, and is kept corked, unless when the 

 bottle is emptied. The bottle is fixed to the 

 wall or tree with wire. The top-opening is 

 1J inches below the level of the top of the 

 curved side, and is regularly bevelled down 

 to the hole through which the wasps, flies, &c., enter. The body of 

 the bottle is made of clear glass. 



Though these bottles are the best traps, the hand-light trap is like- 

 wise very efficient. It is made as follows : Take a common hand- 



W asp-trap bottle. 



Fig. 6. 



Hand-glasses prepared for making a fly-trap. 



glass, the hexagonal or any 

 other form will do (fig. 6) ; re- 

 move in the apex the whole or 

 part of three of the panes, 

 , >, c. Then take a second 

 hand-glass, which must be of 

 the same form as the first, and 

 place it on the roof of the first, 

 so that the sides of the one 

 may coincide with the sides of 



Fig. 8. 



the other ; next stop all the interstices between the bottom of the one 

 and the eaves of the other, at , /, #, with moss, wool, or any suitable 

 substance, which will prevent the entrance or exit of flies. The 

 bottom hand-glass must rest on three pieces of 

 bricks (fig. 8), to form an opening underneath. 

 The appearance of the trap when completed is 



simply that of one hand- 

 Fig. 7. glass above another (fig. 



7). Fragments of waste fruit 



are laid on the ground, under 



the bottom hand-glass, to 



attract the flies, which, having 



once entered, never descend Plan of a fly-trap. 



again to get out, but . rise 



into the upper glass, and buzz about under its roof, 



till, fatigued and exhausted, they drop down, and 



are seen lying dead on the roof of the under glass. 



One of these traps, placed conspicuously on the 

 Hand-glasses ar- ground before a fruit-wall or hothouse, acts as a 

 ranged as a fly-trap, decoy to all kinds of winged insects. 



