112 ON AN APHTHOUS AFFECTION AMONG CATTLE. 
aphthous vesicles ; and no eruption nor other effect was produced* * * § . 
Messrs. Rayer and Bousquet inoculated a child, which became 
feverish on the third day, and subsequently a pustular eruption 
similar to that of herpes came out ; but all these symptoms rapidly 
disappeared!. According to M. Londe, a similar inoculation of a 
child produced an eruption on the face ; but what was the nature, 
and what the characteristics of this eruption I M. Reynal merely 
relates the circumstance, but enters into no details^. 
Until 1840, so far as we know, science did not possess any 
authenticated document that could at all induce a supposition of 
an identity between aphthes and cow-pox. The most celebrated 
authors have not observed it, and we are not aware that any one has 
said more than that in cases where aphthous vesicles have broken 
out on the teats they have caused the development of pustules on 
the hands of those who regularly milked the cows. These histo- 
rical data, combined with the fruitless attempts at inoculation, re- 
move all kind of similitude between the two affections. 
There are, however, some few rare cases of aphthous epizootics 
that present a variety of eruption on the teats not so very un- 
like the vaccine or cow-pox. Our talented veterinary brother, 
M. Levigny, gives us a striking and remarkable example of a 
case of this kind§ : we shall give his own words previously to 
stating our own impressions on the subject. 
“ In many herds of cattle the teats were but slightly or not at 
all attacked. The vesicles of the teats are of a whitish hue , 
transparent , and crystalline in the centre. After they have been 
out some little time they become yellow, and subsequently red all 
round the edges 
Let us pause for a moment to consider these physiognomical 
characters which M. Levigny has assigned to the pustules on the 
teats . Not only are they not the same, but there is a considerable 
difference between them and those of the aphthous phlyctaense. 
In these latter M. Levigny agrees with his predecessors, and finds 
no trace of this crystalline appearance , or yellow hue, or areola, 
which are all characteristics of the pustules of small-pox. 
“ These vesicles,” continues M. Levigny, “ go through the same 
phases with those produced by the vaccine virus, and which they 
appear to resemble in all points. One fact that tends to prove 
this,®! and that almost invariably occurs, is that a great number of 
cows belonging to different herds have communicated the same 
pustules to the hands of persons who have been in the habit of 
* Recueil, 1839, page 142. 
t Idem. 
f Idem. 
§ Recueil dc Medecine Veterinairc, 1842, page 774. 
