16 
left sac, . . . though some stop in the oesophagus, ... in the 
part where the membrane offers the same characters as in the left 
sac of the stomach.” By the same authority it is noted that 
the numbers found in one stomach have been counted from ten 
or more up to hundreds, as 600, 700, or even 1000, and are stated 
“to be collected in one or more groups, one of which is always 
larger than the other.” * 
The maggot when first hatched is long, narrow, and somewhat 
worm-like, but in the stage in which it is best known (up to the 
second moult) it is of the shape figured 
accompanying, and also magnified at 
heading, “3”; namely, for the greater 
part of its length barrel-shaped, banded 
round with rows of prickles or horny 
joints, blunt at the tail end, widest about 
the middle, and gradually lessening in 
size towards the foremost end, in which 
is a slit or opening that serves the pur¬ 
pose of sucking in food, with a brown 
hard hook on each side. When full- 
grown the maggots are about three- 
quarters of an inch in length, and yellow 
in colour; earlier in life they are red 
or flesh colour. 
Where the process of fixing themselves has been observed, it is 
noted that they draw back the mouth hooks until the points are 
close together; then, keeping them side by side, use them as a 
boring instrument, until whatever they are working at is pierced 
well into. Next, spreading the hooks sideways and dragging them 
downwards, the maggots secure such firm hold that no more 
trouble is needed to keep them in place. 
When full-fed, which is after about ten months, they loosen their 
hold, and (as above mentioned) pass along the intestines, and are 
discharged by the animal (chiefly in the summer season, from May 
to August). They then bury themselves in the horse-dung, and in 
a space of time of twenty-four to forty-eight hours turn to chrysalids, 
formed outside of the hardened skin of the maggot, and much 
resembling it in general appearance; in colour, after the first twenty- 
four or forty-eight hours, of a bright brown changing to dark 
brown, almost black, colour. From these chrysalids the fly comes 
out after about four or five to seven weeks in summer. 
* ‘ Parasites and Parasitic Diseases of Domesticated Animals,’ by Prof. L. G. 
Neumann, translated by Dr. Geo. Fleming, p. 356. 
tached to membrane of sto¬ 
mach. After Bracy Clark. 
