EDITORIAL. 
501 
Typho-anhemia of horses so well studied by Vallee and Carre 
furnishes also a no less typical example. The animals which re¬ 
sist infection constitute a true reservoir of virus. One of the 
most active causes of the propagation of this disease is due to 
the importation of horses considered as cured of this affection. 
According to Loeffler the same conditions are applicable to 
foot and mouth diseases, the part played by recovered animals, 
but yet virus-carriers, cannot be denied. 
The third class is made also of the carriers of latent lesions. 
Such as the subjects affected with pleuro-pneumonia with suques- 
trum in the lungs, clinically not made out and also those suffer¬ 
ing with glanders or tuberculosis, which without ever presenting 
the slightest symptom of infection, contaminate so many of those 
with which they come in contact. 
What sanitary measure can be applied against the dangers 
resulting from the presence of these germ carriers? is a question 
which interests all sanitarians, but which will probably remain 
almost completely unanswered! 
■Je¬ 
ns * 
Laughing Gas in Veterinary Practice.— This new 
method considered above for obtaining anesthesia in animals and 
principally the small ones, brings me to relate another which the 
Semaine Veterinaire speaks of, in a recent number, viz.: the 
anesthesia of dogs with laughing gas, which is most interesting 
among the methods of anesthesia of short duration. Some iso¬ 
lated attempts to obtain that have been made with the chloride of 
ethyl and the best results have been obtained with those simple 
operations of daily occurrence in dogs, such as the extraction of 
a tooth, the enucleation of the eye, etc. It is, no doubt, a method 
which deserves the attention of every practitioner ; it gives to the 
surgical interference an elegant method of operation which aids 
in the elimination of some of the old empiricism. 
A veterinarian and a dentist in England have had the idea to 
try in the aog, anesthesia with laughing gas. The trial was 
hazardous and uncertain; so much so that, as the Semaine says: 
