TRICHINA. 
897 
the anterior fifth of the body, opening at the vulva. The csecal 
portion serves as an ovary, then a constriction, an oviduct, a 
wide dilatation, a uterus, a vagina, and finally the vulva. The 
young ova develops in the uterus, and is said to be mature 
when 20 u. in diameter. After the ova is hatched the embryo 
finds its way into the vagina, from the vagina it escapes through 
the vulva. Trichinae, when in the larval state, are found in 
the intermuscular connective tissue, in the primary bundles of 
the muscles, and sometimes in the walls of the intestines. They 
are found in the shape of the letter S, or in a spiral, resembling 
the adult very closely in nearly every feature. 
It was not until the year 1828 that the first trichina was 
positively discovered. It was in London at Guy’s Hospital 
when the first case of trichina was discovered, Peacock being 
the first one to discover trichina. Since that time a great many 
cases have been observed. In 1832 it was found by Hilton, he 
being a demonstrator of anatomy in Guy’s Hospital, London. 
He found them in the body of a very aged man, and existing 
in the form of a cyst. At first the question was undecided 
whether or not it was the trichina cyst, but later on, after 
thorough examination, the cysts were found to be the trichina 
cysts. In the latter part of 1835, there were pieces of muscles 
examined by Wormald and Paget at the St. Bartholomew’s 
Hospital. White spots were found in the muscles, thus deriv¬ 
ing the name of nematodes, which, they said, were coiled back 
upon themselves. Owen studied upon this field of muscle and 
finally gave it the name trichina spiralis. There elapsed a 
period of twenty-five years before the study of trichina was 
again renewed. There was an epidemic of trichinosis in Ger¬ 
many in 1859; then several experiments were carried on by 
great scientific men. For instance, Virchow gave a dog some 
of the human muscles which were invaded with trichina. In 
three and a half days he found in the small intestines worms 
which resembled the trichina, but were larger and nearly egg- 
shaped. The same experiment was repeated a few months 
later by Leuckart, though his experiment was by no means 
