126 ANIMAL PARASITES. 



Schott, the symptoms were the frequent recurrence of ophthalmias, 

 subconjunctival injection, coating of the hinder wall of the cornea, 

 as if w r ith a fine exudative vapour, chronic, but particularly local 

 iritis, which was exacerbated periodically by the constant accom- 

 paniment of rather violent, symptomatic ciliary neurosis, and which 

 made its appearance at the very commencement of the affection. 

 By this the visual power is of course dimmed, at least at times. 

 The diagnosis can only be furnished by the recognition of the 

 worm, which assumes the most various forms. Sometimes the 

 vesicle lies quiet at the bottom, ajid sometimes it rises up and 

 thus covers the pupil entirely, sometimes only partially when the 

 worm has not yet become large and has perfect freedom of motion. 

 A portion of the vesicle may, also, even pass through the pupil 

 towards the posterior chamber of the eye, and thus close up the 

 pupil. The Cestode worm may even appear to be amalgamated 

 with the eye, but this is only an illusion, as this union would be 

 formed not by the worm but by its enveloping cyst, the tendency 

 to the formation of which we find indicated, according to Graefe, 

 in the exudative cloudiness on the hinder wall of the cornea and 

 on the iris, as well as in the adhesion of a circumscribed spot in 

 the vesicle to the lower margin of the pupil by means of yellowish 

 exudation, and in the cylinder described further on. In Graefe's 

 case, a round, milky, somewhat transparent vesicle, of the size of 

 a pea, made its appearance in the anterior chamber of the eye ; 

 on its lower part sat a perfectly opaque, white knob, on which 

 several lateral swellings (sucking discs) were detected even with 

 the naked eye, but better with the lens. The movements of this 

 body were of a peculiar constrictive character, proceeding from 

 the fundus of the vesicle, and diffusing themselves in an undula- 

 tory manner over the lateral portions ; they increased during 

 rapid movements of the eye with simultaneous protrusion 

 and retraction of the head, but were not augmented by increased 

 irritation from light, as Graefe ascertained by the worm remaining 

 quiet when very strong rays of light were allowed to pass through 

 the pupil, greatly dilated by atropine. Even when the axis of 

 vision was perfectly fixed, the animal constantly moved. As to 

 the growth of the vesicle, one of the patients stated, that she first 

 observed it five months previously, and that it attained its full 

 size in fourteen days. Graefe has attached a note of interrogation 

 to this latter statement, but, as I believe, unjustly ; for, in the 

 first place, it follows from Graefe' s statement that the woman had 



