118 COM PTE RENDU OF THE ALFORT SCHOOL 
in the neighbourhood of Lyons. The following is an account of 
three of them that were sent to us. One of them turned round 
and round, but sometimes to the right, and at other times to the 
left. There was no yielding spot on the cranium ; nevertheless it 
was determined to apply the cautery in the way recommended by 
M. Legrand. It was done ; but before night the poor animal could no 
longer keep himself on his legs — the respiration became laborious 
and stertorous, and he died early on the following morning. On 
opening the skull, we found an hydatid, as large as a pullet’s egg, 
at the superior part of the brain, and in the mesian line. 
A second sheep carried his head low ; the visual axis was not 
deranged. He looked straight before him, and rarely turned, and 
when he did, he had no predilection for either side. Five or six 
days after his arrival, he appeared to recover his health spontane- 
ously, and we were about to send him back to the flock to which 
he belonged ; when, all at once, his appetite failed him, and he be- 
gan to turn, and always to the right. On very carefully examining 
the exterior of the skull, we discovered a little flexible spot on 
the right side. We plunged a small trocar into this spot, and, on 
inclining the head of the sheep, a bloody serous fluid escaped. 
On the following morning our patient was not so much depressed, 
and he took some aliment. Three days afterwards, another flexi- 
ble spot was discovered on the left side. We made an incision 
into the skin; and then, by means of a proper instrument, we raised 
the lamellae of the two bony plates of the skull until we had arrived 
at the dura mater. Then, inclining the head, we observed a large 
hydatid quite intact. The sheep died on the following day. We 
now satisfactorily assured ourselves of the existence of the parasite, 
by cutting through the strangely-thinned wall of the left ventricle, 
in which the hydatid was contained. 
The third sheep was so feeble that he was unable to stand or to 
turn. He died before we had an opportunity of examining him. 
An hydatid was found lodged under the envelopes of the brain, in 
the transversal scissure in front of the cerebellum. 
Among the accidents of a somewhat unusual character that have 
occurred, was a perforation of the trachea by the horn of a cow. 
Very singularly, the kind of animal that was thus wounded is not 
mentioned. The wound occurred in front of the trachea, and about 
one-third of the way down the cervical portion of it. The horn of 
the cow had separated, almost without abrading the muscles of that 
region, the sterno-hyo'idien, and the sterno-thyroidien ( sterno-thy- 
ro-hyoideus ), and made a round opening between two of the rings, 
into which the little finger might be introduced, and through which 
the air escaped with a w'hizzing noise. The borders of the wound, 
consisting of the integument and the muscles, were somewhat 
