122 
LIFE, IN ITS LOWER FORMS. 
the cysts in which they had' been enveloped had disap- 
peared ; at the same time most of the worms which had 
been deprived of their cyst had also lost their terminal 
vesicle, which had either been digested or still adhered in 
fragments to the abdominal extremity. All the worms 
found in the stomach, whether with or without their vesicle, 
had their head and ueck withdrawn into the body. 
“ Three hours after ingestion there were no longer any 
worms in the stomach ; they had all passed with the 
chyme from this organ into the small intestine. Then, 
after having lost their cyst and terminal vesicle by the 
digestive action of the stomach, they all, without excep- 
tion, as though feeling themselves at home, had again 
pushed out the head and neck. In all, a distinct lesion 
was perceptible at the abdominal extremity, at the point 
where the terminal vesicle had existed. 
“ In dogs killed several days after the ingestion of the 
Cysticerci, these worms were found greatly increased in 
size ; the largest had attained a length of three inches, 
the smallest of one inch. The body, at first merely 
wrinkled transversely, now distinctly exhibited the articu- 
lations, and tho point torn by the loss of the vesicle 
actually presented a cicatrix. 
“ After twenty or twenty-five days, the worms were 
several inches in length ; they were ai-ticulated to the 
extremity of tho abdomen, and the last of their joints still 
bore the cicatrix above mentioned, which was still very 
perceptible ; traces of sexual organs even were already to 
be discovered in the posterior segments. 
“At the end of eight weeks the worms had attained a 
great length (the longest were from 36 to 39 inches). 
