440 
M. L. TRASBOT. 
This division was acceptable, and even in those days obliga¬ 
tory. When the irregular manifestations of the disease only were 
considered necessary, these were to be classified. To day this can¬ 
not be. It is necessary to consider, first the normal form, and 
then all that which was looked upon as belonging to it. 
Desiring to prove that gourme is essentially equine variola, I 
must first speak of the pustular eruption, and afterwards mention 
all the inflammatory accidents resulting from any cause interfer¬ 
ing with its development. 
The regular eruption of gourme was described under the name 
of horse-pox, by M. Henry Bouley, Yol. IX of the Dictionnarie 
and Medecine Veterinarie. It would be useless for me to repro¬ 
duce it. Complete and precise as it is, I would have nothing to 
add to it. There is, however, a point of detail upon which I may 
say a word, and that is relating to the configuration of the pustu¬ 
les at the middle period of their evolution. 
M. Bouley says : “ These vesicles were smooth at their sur¬ 
face without any depression; they had a pearly appearance.” 
This is indeed their true form when they appear after what may 
be called the internal infection. They are regularly hemispheri¬ 
cal, until the time when the epidermis which covers them is 
torn or raised as a small disk, to allow the escape of the virulent 
serosity accumulated underneath it. 
Still, all authors repeat that the pustule of horse-pox, like that 
of vaccine, is umbilicated at its apex when it arrives at the period of 
secretion. Many amongst them indicate even this center of depres¬ 
sion as a condition almost specific. This is an error, resulting from 
the fact that it is inoculated horse-pox which has been always ob¬ 
served. The umbilicated condition is, indeed, seen only upon pustu¬ 
les developed at the point proper of the inoculation. All the others, 
if they have not been frayed at their summit, remain perfectly 
rounded, till the time when their epidermis is falling off they are 
covered with an irregular scab. Things are here identical to what 
they are in sheep, and probably also in all other variola. 
When a sheep is inoculated with variola, the pustules which 
are developed at the point of puncture are also developed in their 
center at the period of secretion, while all over in other places, 
