BOTS. 157 
“The eggs of this species are difficult to be seen upon the horse’s skin 
or beard, owing to the agitation of the beast, and from the color of the 
egg being dark like that of the skin of the horse. The animal has been 
generally too impatient, while undergoing this pperation, to let me exam- 
ine them very well. I ascertained, however, its form by pressing one 
of these eggs from the abdomen. 
“The larva or grub of this species inhabits the stomach as the former, 
generally adhering to the white lining, and is disposed promiscuously in 
dense clusters, after the same manner; they may, however, be dis- 
tinguished from them by being in general smaller and longer in pro- 
portion to their bulk. 
“The larva of this species may be obtained from almost any horse 
that has been much the preceding year at grass, and exposed to these 
flies, and will be found during the summer months sticking more or less 
within the verge or opening of the anus, adhering to its soft lining, and 
producing considerable irritation and uneasiness. Indeed, I once well 
remember being on a tour of pleasure in the Isle of Wight, and ex- 
periencing much annoyance from these larve. The little horse I had 
hired for the journey became so lazy and unwilling to go on, and moved 
so awkwardly, that I could not keep pace with my company, and I was 
at a loss how to proceed ; but on casually taking up the tail, I discovered 
three or four of these insects hanging to the rectum, and their removal 
instantly proved a cure.” 
For more ample particulars, the reader is referred to the book itself, 
which is entitled ‘“AN Essay on Bors In THE HorRSE AND OTHER ANI- 
MALS.” It will, in the pages of the original work, be seen that Mr. 
Clark more than suspected the existence of other species of the same 
family; but, as no positive knowledge has yet been gained, we must 
await patiently the inquiries of those to whom this branch of science 
belongs. 
However, the writer must dissent to Mr. Clark’s conclusion, that 
“bots are harmless, if not beneficial.” How far does such a supposition 
agree with the perforated stomach, preserved at the Royal Veterinary 
College? How far does it accord with the ragged coat and unthrifty 
aspect by which the presence of the parasites is ascertained? How, 
when crediting such a conjecture, are we to account for the horror ex- 
hibited by the horse at the approach of the fly; and how can we interpret 
Mr. Clark’s experience in the Isle of Wight ? 
Bots are known to be injurious; healthy bodies are seldom troubled 
with parasites. The parched and innutritious grass of the summer’s 
heat cannot support the life accustomed to artificially saved and carefully 
prepared food. It is the meanness of the master which dooms the slave 
