REVIEW — Mil. PERCIVALL’S HIPPOPATHOLOGY* 113 
sary not only to ascertain the state of the eyes of the sire and 
dam, but of the great sire and great dam also ; when, in more 
than one case, we opine the above will be found to hold good. 
This is the main point of difference between our author and our- 
selves : on the others he shall first speak for himself, and the 
quotation will give a fair specimen of his style of treating his 
subject. 
“ Relapses are looked for as a matter of course. There are in- 
stances of horses being fortunate enough to have experienced but 
one attack, and that not of a destructive character ; and, as I have 
already stated, cases have occurred in which a single attack has 
deprived the organ of vision : these, however, are both exceptions 
to the general rule of progress. Ordinarily, the disease, after 
attacking one eye, relapses in the other, and continues this alter- 
nation until the animal is rendered totally blind by its ravages, 
the work of destruction being, as I observed before, commonly 
effected, as it were, by instalments. It is not the violence of the 
disease that we have to dread so much as these vexatious re- 
lapses. The eye is enabled, perhaps, with the veterinarian’s aid, to 
‘ weather the storm,’ and come tolerably clear out of the attack ; 
hardly, however, has it regained its usual lustre, and is again be- 
ginning to be useful to the animal, than a fresh invasion of the 
disease involves either it or its fellow in all the danger out of 
which it has but just escaped, every succeeding relapse leaving 
the organ in a more deteriorated condition. It may commence 
in both eyes, and relapse in one ; or begin in one, and relapse in 
both : this last case, however, I believe to be the rarest, and it 
is surprising how many returns of the disease some horses will 
experience before the eyes become disorganized ; for that alone 
appears to put an end to relapses. There is a horse at present in 
my regiment who has had fifteen attacks in his eyes, alterna- 
tively, and still, from preserving some vision, is doing his duty. 
Another has had seven attacks in the same eye ; two others have 
experienced each of them five attacks, and have gone quite blind. 
It has been said, that, as soon as cataract is completely formed, 
relapses cease. This, however, is not always the case. The dis- 
ease will often re-appear, again and again, even after the pupil is 
completely opaque. In fine, as I said before, nothing short of 
