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On examining the brain of sheep thus affected, what appears to be a watery bladder, called a hydatid, is found, which may be either small or of the size of a hen’s egg.

It occurs in connexion with recent pregnancy, and particularly with the variety of abortion termed hydatid mole.

As good a hold should be taken with the string as possible, and all the water should be allowed to flow out before any attempt is made to extract the remains of the hydatid.

In this malady, there is a loss of equilibrium between the nervous and muscular systems, which may arise from hydatids in the brain, offering mechanical obstructions to the conducting power of the nerves.

There were slight opacities in many parts of the tunica arachnoides; in the ventricles about four ounces of water were contained—some large hydatids were discovered on the plexus choroides of the right side.