EXTRACTS FROM FOREIGN JOURNALS. 
125 
, ?r much trouble and by using considerable force. Quite a severe 
i norrhage took place after the operation, but was easily con- 
led by cold water bandages and pressure. 
The fistulous tract immediately began to close up, and in one 
ik no trace of it could be found. The granulations are yet quite 
minent, but are decreasing in size. The animal was discharged 
3ral days since, but is still brought back for dressing. The 
e of bone removed was about six inches long and one in width, 
was taken out in two pieces. 
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EXTRACTS FROM FOREIGN JOURNALS. 
] IMPERFORATION OF THE POSTERIOR MEDIASTINUM AND 
THE DISTINCT INDEPENDENCE OF THE TWO PLEURAL SACS 
IN THE HORSE—PRACTICAL CONCLUSION. 
A paper read before the Societie Centrale de Medecine Yeterinaire, by 
M. Barrier. 
Allow me to occupy your attention upon a disposition of the 
j :er ior mediastinum of the horse, not mentioned in our class- 
works on veterinary anatomy. 1 refer to the fact of the 
i erforate formation of that system, and of the distinct separa- 
between the two pleural sacs. 
It is known that on the cadaver, the posterior mediastinum 
narily appears covered, more or less, with little openings, 
di seem to establish a communication between the two pleural 
'! These openings are sometimes seen also on the anterior, 
certainly are these less numerous than in the posterior medi¬ 
um]. Our views on this subject are so frequently proved by 
actions and clinical observations, that every veterinarian 
pts them as the expression of a normal condition, and believes 
the conclusion of .double pleuritic exudation is the proper 
?al consequence of it. 
But in truth, these affirmations are quite too absolute. If the 
oration of the median septum is apparently the rule, it is not 
invariable law, but is subject to a great many exceptions. I 
) thought proper to call your attention to this physiological 
