EXTRACTS FROM EXCHANGES. 
683 
hind leg secured and by violent tractions, made in different di¬ 
rections, the calf was extracted. As soon as it dropped from 
the vulva, the entire body folded in two as the leaves of a new 
book recently opened. The cause of the trouble was a right 
lateral complete and a congenital torsion of the spine with pre¬ 
sentation of the left flank .—{Annales de Beige}) 
Persistency of the Ductus Arteriosus in a Dog {.By 
Mr. E. LienatLx \.—The obliteration of the ductus arteriosus is so 
complete at birth that at that time the arterial canal is replaced 
by a fibro-elastic band which unites the two principal^ aortic 
trunks, the pulmonary artery and the aorta. The persistency 
of the communication is very uncommon and has given rise to 
functional and anatomical disturbances in a young dog, five 
to six months old, which ended in death. The symptoms ob¬ 
served were : general loss of strength, absolute anorexia, re¬ 
peated cough, no expectoration, accelerated breathing, with 
marked difficult inspiration, low dullness on, percussion above 
the heart, normal sound anywhere else, cracking sounds 
in the lungs; hard whistling sound heard with the systole 
of the heart, femoral pulses very strong, venous pulse to 
the jugular with the ventricular systole. Temperature 40.1°. 
Post-mortem : Heart is large, left ventricle thickened, right 
ventricle dilated and also hypertrophied; tricuspid opening 
enlarged, valve intact; pulmonary opening too narrow. The 
aorta and pulmonary arteries communicated by the ductus ar¬ 
teriosus, which is as big as the pulmonary artery. Its walls 
are thicker and harder; it is inverted obliquely on the aortic 
trunk. The aorta is largely dilated from its origin to above the 
insertion of the ductus arteriosus, then it suddenly contracts 
and assumes its normal dimensions. It is a true aneurism, with 
thin but yet stiff walls .—{Annales de Beige.') 
Rupture of the Perforating Tendon in a Saddle 
Horse {By Mr. F. Hendrickx \— A saddle horse, seven years 
old, carrying a heavy man on his back, was submitted for an 
hour to a rapid gait. Returned to the stable, he presented 
nothing abnormal except a little stiffness of the left hind leg. 
The next day the left hind fetlock was swollen and very pain¬ 
ful ; the swelling was localized to the posterior part of the joint. 
Suspecting a synovitis of the great sesamoid sheath, treatment 
was applied and improvement followed, wdien a few ^ days later 
suppuration became manifest. This was soon complicated with 
! laminitis of the right hind foot. Notwithstanding the treat- 
I nient, general disturbances became more marked, excessive 
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