BOTS. 155 
are most liable to be licked with the tongue; and the ova, therefore, are 
always scrupulously placed within its reach. 
“The eggs thus deposited I at first supposed were loosened from the 
hairs by the moisture of/the tongue, aided by its roughness, and were 
conveyed to the stomach, where they were hatched : but on more minute 
search I do not find this to be the case, or at least only by accident; for 
when they have remained on the hairs four or five days, they become 
ripe, after which time the slightest application of warmth and moisture 
is sufficient to bring forth in an instant the latent larva. At this time, 
if the tongue of the horse touches the egg, its operculum is thrown open, 
and a small active worm is produced, which readily adheres to the moist 
surface of the tongue, and is from thence conveyed with the food to the 
stomach. 
“ At its first hatching it is, as we have observed, a small active worm, 
long in proportion to its thickness, but as its growth advances, it becomes 
proportionably thicker and broader, and beset with bristles. 
“They are very frequent in horses that have been at grass, and are 
in general found adhering to the white insensible tissue vr coat of the 
stomach. 
“They usually hang in dense clusters to this white cuticular lining of 
the stomach, and maintain their hold by means of two dark-brown hooks, 
between which a longitudinal slit or fissure is seen, which is the mouth 
of the larva. When removed from the stomach by the fingers by a 
sudden jerk, so as not to injure them, they will, if fresh and healthy, 
attach themselves to any loose membrane, and even to the skin of the 
hand. For this purpose they sheath or draw back the hooks almost 
entirely within the skin, till the two points come close to each other; 
they then present them to the membrane, and keeping them parallel till 
it is pierced through, they expand them in a lateral direction, and after- 
ward, by bringing the points downward toward themselves, they include 
a sufficient piece of the membrane, to remain firmly fixed for any length 
of time as at anchor, without requiring any further exertion. 
“These bots, as is also the case with two or three other species, pass 
the autumn, winter, and spring months in the stomach, and arrive about 
the commencement or middle of the summer at their full growth, requir- 
ing a twelvemonth fully to complete their structure.” 
“ON THE GSTRUS HEMORRHOIDALIS, OR FUNDAMENT BOT. 
“The part chosen by this insect for this purpose is the lips of the 
horse, which is very distressing to the animal from the excessive titilla- 
tion it occasions; for he immediately after rubs his mouth against the 
