CYSTJCJE11CUS IN THE EYE. 131 



which Graefe does not explain any further, must strike one. 

 The explanation appears to me to be simple. The Cysticerci 

 themselves are translucent and bluish. As, in employing the 

 ocular speculum, we examine the eye by lamp-light, the bluish 

 tint thus in the first place acquires a greenish appearance. But 

 then, in this case, the colour of the vitreous humour and its 

 changes, in consequence of the inflammation of the retina, and 

 the complementary colour of the exudation and of the lamp-light, 

 must also be taken into consideration. 



In a fourth case Graefe saw the Cysticercus lying on the retina, 

 projecting very far into the vitreous humour, and enclosed in a 

 system of folded, floating, but tolerably transparent membranes. 

 This also was observed by the patient, probably by chance, in the 

 first period of pregnancy. The consequence was a complete 

 amaurosis, except a feeble glimmering of light beneath and on the 

 outside. The other sound eye participated consensnally with sub- 

 jective appearances of light and a diminution of the power of 

 vision without perceptible material changes. T. solium not men- 

 tioned. I cannot omit to call attention to the fact, that in the 

 eye of the pig, also, Cysticercus cellulosce prefers the vitreous 

 humour and the retina for its habitation. Thus Von Nordmann 

 in one case found six Cysticerci in the vitreous humour, and, on 

 the posterior Avail of the same eye, beneath a membranous coat, 

 six other Cysticerci close together. 



e. Under the retina. — In this situation Von Graefe (' Deutsche 

 Klinik/ No. 45, 1856; ' Sitzungsber./ August 11th) has seen a 

 Cysticercus, the removal of which, with the aid of the speculum, 

 he thinks might be possible. 



/. In the brain. — Here we should require to be very prolix, if 

 we were to describe the particular symptoms according to the 

 position occupied by the cystic worm. The general observations 

 on the formation of tubercles in the brain are of use here, and we 

 refer to the pretty well established facts upon this subject, which 

 will be found laid down in every text-book of pathological 

 anatomy and pathology, upon pseudoplastic deposits in the brain. 

 In the general section upon the migration of the Ccenuri into the 

 brain, we have represented pretty exactly the consequences of the 

 migration of Cysticerci into the brain, and only the vertiginous 

 movements need to be excepted from amongst the symptoms in 

 the human subject. Where these symptoms occur, a rapid 



