4G2 CYSTIC STAGE OF T.ENIA S AGIN ATA. 



From the character of the bladders one could not help noticing that 

 they represented the early stages of a new Cysticcrcus, different from 

 the Cysticercus celluloses of the pig. 



A second feeding experiment, which I began on the 27th December, 

 enabled me to supplement the results of the first. 



Remembering the fatal issue of the former case, I used smaller 

 doses. First I gave twenty-five proglottides, and then several doses 

 of from five to eight at intervals of five or six days. After between 

 forty and fifty joints had thus been administered from two tape- 

 worms, voided soon after one another, the feeding process ceased. 

 Twenty days after the first infection many pathological phenomena 

 (loss of appetite, fatigue, ruffling of the hair, and fever) appeared, 

 which gradually increased to such an extent that I was for a while 

 afraid that the animal would not survive. Towards the middle of 

 the second week the disease diminished, till finally perfect health 

 returned. 



Forty-eight days after the first, and thirty after the last feeding, I 

 extracted the sterno-mastoid muscle of the left side. Even during the 

 operation I observed, to my joy, the Cysticerci embedded among the 

 fibres. They had a somewhat oblong shape, and varied from 3 to 

 5 mm. in their longest diameter. Their appearance was still some- 

 what dull, but I saw the worm glimmering through the walls. It 

 was generally situated in the middle, whilst the ends of the cysts 

 were completely filled by the abundant granular cells and exudation- 

 granules. 



In the extracted muscle I counted perhaps a dozen cysts, among 

 which there were some with wrinkled walls, and dead or disintegrated 

 inmates. 



The worms without their shells measured between 2 and 3*6 mm. 

 in their longest diameter. The smaller specimens were almost all 

 spherical, while the larger already possessed a distinctly oblong form, 

 with diameters of 3*6 and 2 mm. Otherwise these parasites were like the 

 young tape-worms of the pig of the same age, and this to such a degree 

 that, without knowing the circumstances and without close examination, 

 the two forms might easily have been confused. In regard to the point 

 where the head is fixed there is at this period no difference, since the 

 head springs from the equatorial zone, instead of from the end of the 

 body, and is seen as a white opacity in the otherwise translucent wall 

 of the bladder. The previously divergent situation of the head sug- 

 gests an inference as to the phenomena of growth in the bladder-worms 

 of the muscles, and justifies the statement that their longest diameter 

 is by no means morphologically identical with the long diameter of 

 the other bladder-worms. 



