History of the Nematode Worms. 343 
Trichine are not only “very probably not the same that we find 
in the pig,” but that they have nothing at all to do with the 
Trichine, but are rather very probably young Ascarides. More- 
over the worms do not occur only in the muscular tissue, but, 
as Herbst has already correctly indicated, just as frequently in 
other structures, especially the lungs and liver, and indeed so 
universally that one can hardly examine a mole without finding 
more or less numerous specimens in it. In the last-mentioned 
organs the presence of the worms betrays itself, even to the 
most superficial examination, by the fact that here each of them 
lies in a tuberculoid knot formed by an aggregation of granular 
cells, and constantly surrounded in the lung by a small area of 
hepatized pulmonary tissue. On the other hand, I have never 
seen the worms of the muscles encysted thus, but always free an 
the interior of altered muscular fibres ; for it is in this light that 
we must regard the tubes, filled with granular matter and en- 
closing the worms, which are imbedded between the other, nor- 
mal muscular fibres. Where the worm, with its more or less 
tortuous body, lies, this tube usually presents a larger or smaller 
dilatation, or perhaps, more correctly, a series of four or five 
alternate small dilatations, which correspond with the curves of 
the body and change with every movement of the animal. And 
these movements are so little obstructed that the worm creeps 
along for a considerable distance in the tube in either direction 
with its (obtuse) cephalic extremity in front, and even frequently 
turns about and returns upon its previous path. During this 
process the granular contents of the tube are displaced and 
pushed aside. In certain places we may see in the interior of 
the tube a distinct impression of the body, but this, appa- 
rently, only where the worm has stayed for some time. During 
the ordinary movements, the granular contents flow together at 
once behind the advancing worm, so as to form a continuous 
mass. With the exception of its contents, the muscular tube is, 
however, entirely unaltered; we observe neither a thickening of 
the sarcolemma, nor even an increase of the surrounding areolar 
tissue, such as. is observed in the vicinity of the Trichine and 
Ollulant of the muscles. 
With the exception of an inconsiderable difference of size 
(0°38-0°43 millim.), the worms are all of the same structure. 
They are slender, truncated anteriorly, furnished with a tuber- 
cular boring-tooth on the lower lip, and with a short, conical 
tail, the end of which forms a separate short point, as in many 
Strongylide. The cesophagus, which is somewhat thickened 
posteriorly, is of considerable length, and has a granular texture, 
but has no trace of the so-called cellular body occurring in the 
Trichine., 
