480 REPORT ON /OOLOttY, MDCCCXLIV. 



became more constant. She could scarcely walk alone, from 

 a frequent tendency to stagger. The pain in the head 

 became constant, though never extremely acute ; her sight 

 became dim, and, after frightful convulsions, she expired 

 towards the end of October 1840. On examination after 

 death, the vessels on the surface of the brain were found 

 moderately congested, and the sub-arachnoid cellular tissue 

 was infiltrated with serum ; but the most remarkable morbid 

 appearance which the organ exhibited arose from the pre- 

 sence of numerous small fibrous cysts in the pia mater, 

 covering the surface of the hemispheres, and dipping be- 

 tween the convolutions of the brain. These cysts were 

 present on both sides, but were most numerous on the 

 surface of the left hemisphere. They varied in size from 

 that of a pea to that of a small peppercorn ; they were 

 seated in the pia mater, but had become partially imbedded 

 in the gray matter of the convolutions. None existed in 

 the white matter, in the central ganglia, nor in the plexus 

 choroides. A few were found at the under surface of the 

 cerebral convolutions ; but none either in the cerebellum or 

 medulla oblougata. The cerebral tissue around the cysts 

 appeared natural, as to colour and consistence, and the 

 brain generally, except for the presence of these animals, 

 would have been termed healthy. There was, it should be 

 added, however, rather more fluid in the ventricles and at the 

 base of the brain than is natural. No traces of the para- 

 sitic animals were found in the chest. Several of the cysts 

 which had been removed were afterwards examined, and 

 each was found occupied by a vesicular worm, consisting of a 

 posterior semi-transparent vesicle, and an anterior cylin- 

 drical portion, which lay retracted in the former, like the 

 finger of a glove turned inwards ; the latter part was fur- 

 nished at its extremity with a double circlet of hooks, round 

 which were seen four oval suckers. The animal, in short, 

 answered exactly to the Cysticercus celluloses of Rudolphi. 

 In some of the cysts the animal had evidently perished and 

 was undergoing decay, but still retained sufficient traces of 



