38 
named it Oe. Ericetorum, but now conjectures it is no other than 
the male of the Oestrus Bovis. 
Its face strongly resembles that of an ape, and the remark in 
my dissertation above quoted was made from obseiving this spe¬ 
cies. “ Frons etiam quadrupedis nonniliil svnulat, presertim simice ■ 
hoc in Oe. Hcemorrhoidali maxim,e conspicuum est,” &c. Lin. Soc. 
Tr. 3. p. 325. The hairs in the upper part of the face also form 
an arched projection not very unlike the projection of the skull 
of the monkey over the orbits of the eyes, and the black an- 
tennaj sunk in the head, have much the appearance of eyes.—See 
fig. 32. 
On the probable Effects of the Gastric Oestri upon Animals. 
Unacquainted with their history, the appearance of inhabi¬ 
tants like these in the living stomach, would, to superstitious 
people, or even in strong minds, produce apprehensions of their 
pernicious or fatal effects, especially when they saw the coats of 
the stomach eroded as it were in holes nearly through by them , 
yet but few horses exposed on the commons can escape having 
them, and the perfect health they enjoy with them is a proof 
sufficient of their innocuous nature and harmlessness in a general 
way. 
That the coats of the stomach are not particularly irritable to 
mechanical stimuli, is proved from daily experience by offences 
committed against them. Some kind of fishes have theii sto¬ 
machs completely perforated through by the bones of the fishes 
they feed upon, without any derangement of their health, oi 
probably much sensation ; and the white tissue of the Horse’s 
maw is certainly less sensible than the other parts of the stomach, 
that it is fair to conclude our apprehensions of their effects have 
been carried much too far : if the tone of the stomach should be 
changed by inflammation or other disease, their roughness might 
