334 ANIMAL PARASITES. 



description, with the exception of a few small errors, leaves 

 little to be added, for which reason we shall here examine 

 the worm, its mode of life, and its other peculiarities, in accord- 

 ance with Luschka's communications in the third volume of 

 Siebold and Kolliker's ' Zeitschrift fur Wissenschaftliche Zoologie/ 

 pp. 69 79, at the same time making use of the facts demon- 

 strated by Meissner with regard to the migration of the young 

 of the Gordii in the seventh volume of the same journal, and also 

 weaving in our somewhat different views as to the structure, 

 mode of immigration and derivation of Trichinae. The 

 seat of the worm is, as is well known, the muscles of volun- 

 tary motion, and it is sometimes so diffused in these, that even 

 the smallest muscles, such as those of the tympanum, the internal 

 muscles of the larynx, of the eye, and of the tongue, the mus- 

 cular fibres of the alimentary canal down to its middle, the 

 diaphragm, the constrictor cunni, the sphincter ani interims, &c., 

 are not spared. In the heart and the sphincter ani externus, 

 however, no traces of this worm have yet been found. The 

 muscles inhabited by Trichina are, as it were, found throughout, 

 both on the surface and in their depths, with small, dingy-white 

 granules, resembling grains of sand. The arrangement of the 

 capsules of the worms within the muscular tissue is irregular; 

 sometimes they lie in groups, sometimes singly, sometimes 

 arranged in a line one behind the other, but do not usually touch 

 each other with their ends, as both Luschka and I can prove, 

 although this contact, described by Owen, may easily take place 

 in other cases. In the places where the capsules of Trichina are 

 seated, fatty tissue is constantly inserted, and indeed, generally 

 at their anterior and posterior extremities ; this, which is 

 collected together in large globules or cells, is placed about 

 the Trichina which occur singly, in such a manner that the 

 layer of fat is thickest in the neighbourhood of the ends of 

 the capsule, but thence gradually diminishes in a conical form 

 towards the surrounding spot of muscle which has remained 

 free from Trichina, so that we see distinctly that the fat is only 

 deposited to fill up the space which must necessarily be produced 

 after the Trichina has penetrated between a couple of muscular 

 fibres, and pressed these apart. A discoloration of the muscle 

 inclining towards a pale red, or a greater degree of softness, can 

 hardly be a consequence of the worm itself. In Luschka's 



