666 ANALYSIS OF CONTINENTAL JOURNALS. 
Etiology .—Adenitis equina affects the horse almost ex¬ 
clusively, but the reason for this is not known. Young 
horses are most liable to it, and conjecture might ascribe it 
to the greater development of the lymphatic system in them. 
Certain conditions favour its appearance in youth, such 
as dentition, a delicate constitution, improper hygiene, in¬ 
habiting cold stables, a sudden change from green to dry 
food, and the use of oats and new hay. The occasional 
cause is to be found almost exclusively in chills; the disease 
is most common in cold rainy weather, in spring and autumn. 
Once developed the adenitis equina has the power of trans¬ 
mission by contagion. This was denied by Delabere Blaine, 
Clater, Huzard, and others; but corroborated by the majority 
of practitioners, and demonstrated experimentally by several 
authorities, among them being Viborg and Reynal. The 
contagium is fixed (Spinola), and its action is limited to the 
equine species; the foal being much more susceptible to its 
influence than the adult horse. In the experienceof Professors 
Falconio and Qreste, it is only necessary to make a healthy 
foal cohabit with one suffering from the disease to produce 
the malady in it; but an adult animal may dwell beside a 
sick one with impunity. 
With regard to the question of a second attack, it appears 
to be established that one attack affords exemption from 
another. A military veterinary surgeon has never witnessed, 
among six hundred horses, a second appearance of strangles. 
Hering has remarked that it is not contagious in all its stages, 
but only when it is most developed. Donnarieix is of the same 
opinion. 
It has been stated that the disease is unknown in hot 
climates, that it is rare in Spain and Africa, and scarcely 
known in several provinces of Russia. Huzard believed this 
exemption was due to the 'alimentation of the horses on 
barley and straw, instead of hay and oats. Rodet assures 
us that in Italy, Spain, Egypt, and Arabia, horses do not 
contract the disease so long as they remain in their own 
country. The facts cited by Desplas, and the observations 
made in Asia, Africa, and Italy, demonstrate that this asser¬ 
tion is erroneous. 
Prognosis .—-When the disease is benignant the prognosis 
is favorable; but if irregular, then much will depend upon 
circumstances. When it assumes an unsatisfactory course 
under a suitable method of treatment, and the consecutive 
morbid states appear, then the cure is problematical and the 
prognosis, if not unfavorable, should at any rate be reserved. 
In malignant cases a fatal termination may be anticipated. 
