I 
5SS 
EXTRACTS FROM 
EXCHANGES. 
2. Immunity lasts only from 2 to 4 weeks. 
3. The curative effects are surer to ensue the sooner the 
animal is inoculated with the specific microbe or with the 
ptomaines separated from the bacillus. 
The serum therapy of tetanus unfortunately has a draw¬ 
back. While in diphtheria we can inject diphtheritic serum 
at the beginning 1 of the illness, at the time of the appearance 
of the false membrane, and can thus anticipate blood-poison¬ 
ing, important in tetanus, we cannot anticipate blood-poison¬ 
ing by the injection of tetanus serum, because, by the time 
the diagnosis of tetanus is made, the blood has been poisoned 
to a greater or lesser degree. Nocard thinks that the tetanus 
serum can only be regarded in the light of a prophylactic; he 
believes that it will not affect the course of a tetanus already 
established. 
But in regions where tetanus abounds idiopathically, or 
where it follows wounds or surgical operations, two serum 
injections of 10 cm. each in the course of fourteen days will 
render the animal immune for a period of one and a half to 
two months. 
The serum keeps its efficacy and purity for at least six 
months provided the flask is kept from heat and light, and 
opened only at the time of the injection.— Oest. Monatschr . /. 
Thierhlk. 
IMMUNITY AGAINST FOOT AND MOUTH DISEASE ESTABLISHED 
BY POTASSIUM IODIDE. 
Prof. P., of the University of Prague, has made a discov¬ 
ery important enough to be brought to the notice of our 
readers. 
For the purpose of curing syphilitic children, he made 
an agreement with a farmer to dose two of his cows with 
iodide of po'ash so that he could give the milk thus iodized 
to the children. One of the cows received 12 grams of iodide 
of potash for eight weeks, the other for ten weeks; these 
were housed with 68 other cows. During this time, foot and 
mouth disease occurred in the stable. At first two cows 
sickened, then others in the neighborhood. To shorten the 
