46 
skin, to which from its warmth, which is very considerable, ft 
readily adheres, the pouch being opposite the opening. When¬ 
ever the insect makes its way out and falls from the abscess it is 
caught by the bag, in which, as it cannot escape, it remains till 
removed by the person looking after them. The larva thus 
obtained, as it is full fed, will hardly fail to produce a perfect fly ; 
it is only necessary to put it into a pot with some loose light 
earth for it to change upon. 
That we may continue the history of these flies with some 
degree of uniformity. Are shall commence its operations with 
some remarks on the deposition of the eggs, as we have done 
with the former species. This act appears to be attended with 
severe suffering or apprehension at least, which makes the cattle 
run wild and furious and gad or stray from the pastures ; and 
hence the ancient epithet of Gad-Fly. When yoked to the 
plough, the attack of this Fly is attended with real danger, since 
they become perfectly uncontroulable, and will often run directly 
forwards through the hedges, or whatever obstructs their Avay. 
There is provided on this account, to many ploughs a contrh 7 - 
ance immediately to set them at liberty. When the cattle are 
attacked by this Fly it is easily knoAvn by the extreme terror and 
agitation of the whole herd; the unfortunate object of the 
attack runs bellowing from among them to some distant part of 
the heath or the nearest water ; the tail, from the severity of the 
pain, is held with a tremulous motion straight from the body, and 
the head and neck stretched out to the utmost. The rest from 
fear generally follow to the water, or disperse to different parts of 
the field. See Plate II. fig. 1, 
And such is the dread and apprehension in the cattle of this 
Fly, that I have seen one of them meet the herd Avhen almost 
driven home, and turn them back, regardless of the stones, sticks, 
and noise of their drivers ; nor could they be stopped till they 
reached their accustomed retreat in the water. 
