ON THE DISEASES OF DOGS. 17 
from the capillaries, both into the parenchyma of the viscera and 
from the mucous surfaces. 
Although animal effluvia infects the healthy chiefly by their dif- 
fusion in the atmosphere, yet the infection will not take place 
unless near their sources, or in situations where they become con- 
centrated ; much, however, will depend upon the predisposition or 
susceptibility of the animals exposed to them. If, however, other 
causes are superadded ; if the animal is confined in close ill- 
ventilated places, or breathe a close humid air laden with animal 
exhalations ; in fact, whatever depresses the powers of life may so 
alter the form of the disease, that it may become consecutively and 
conditionally infectious, and even epizootic. 
It is obvious that an animal may be exposed to a source of in- 
fection in one place, and may travel a long distance during the 
period of formative action, and not experience the developed 
malady until after his arrival in a healthy locality, where he may, 
under certain circumstances, introduce the infection. Neither age 
nor sex appears to influence the liability to an attack. 
[To be continued.] 
ON THE DISEASES OF DOGS. 
MALADIE : COUGH, COLD, GLANDERS, CATARRH, CORYZA, AND 
GASTRO-BRONCHITIS. 
By the late M. HURTREL D’Arboval. 
From Le Dictionnaire de Medecine Vet4rinaire. 
[Continued from vol. xvii, p. 700.] 
OTHER extraordinary phenomena may also manifest themselves, 
which announce that the disease is complicated with an affection 
of the nervous system generally. The symptoms that supervene 
in this case are not unlike those of epilepsy, and this complication 
not unfrequently appears with the disease, or during its first epoch. 
The phenomena appear by fits, which are not equally violent in 
all cases. The animal is usually standing when the fit commences, 
with violent agitation of the head, trembling of the hind parts, and 
chattering of the jaws. The muscles of the face are spasmodically 
convulsed — the lower jaw strikes against the upper one rapidly 
and repeatedly — the animal utters trembling cries — runs rapidly 
round the place in which he happens to be — loses his sight — 
VOL. XVIII. D 
