342 ANIMAL PARASITES. 



tinctly saw the worm alive in putrefying muscle. Luschka never 

 remarked movements of the worm as long as it is inclosed in its 

 cyst ; and I only succeeded in seeing the free Trichina move, 

 which they did very briskly. There is a very simple means of 

 setting the worm free easily, which 1 do not find referred to by 

 others, and which I will therefore describe here. All that is 

 necessary is to remove one or both poles of the capsule of 

 the Trichina by a perpendicular incision with a fine scalpel, 

 and the expulsion of the worm may then easily be effected by 

 pressure. The fear of injuring the worm by this incision is un- 

 founded, because the worm always occupies the middle of the 

 capsule, which, at the same time, presents the greatest diameter, 

 and is still in the coiled-up state whilst within the capsule. 



The skin of the body is glassy and transparent, but -composed 

 of a great number of rings, the limits of which, as already stated 

 by Luschka, are marked by fine circular lines, which give the 

 worm a transversely striated aspect, and on the concave margins 

 of its curvatures a very finely serrated appearance. Besides the 

 transverse strias, M T e also find a few longitudinal striae in the 

 skin. Moreover the articulated or ringed appearance just 

 described, is observed still more distinctly in incrusted and 

 even in dead individuals, on which account this appearance is 

 no product of the preservation of the worms iu spirit, as Heule 

 formerly stated. 



From the further statements of Luschka, and the figures 

 given by him, which, with the exception of the deficient anus, 

 are perfectly true to nature, and which are, consequently, copied 

 by me, only corrected by the insertion of the anal orifice, it has 

 become easy to trace the anatomy of the animal, and both by 

 tearing the worms with needles, and by the application of pres- 

 sure, I have perfectly produced that interesting and instructive 

 form which Luschka has figured to render the alimentary 

 apparatus intelligible. The head is represented, not, as the 

 observers before Luschka supposed, by the thicker extremity 

 of the body, but on the contrary by the thinner one. I have 

 observed, also, as Luschka states, that the animal performs, as it 

 were, movements of examination with the thinner extremity of 

 the body, and that a protrusible and retractile pedunculated 

 papillae sometimes projects from this thin end, which also 

 remains after death. From this pointed head there runs, in 

 the first place, in the median line of the animal, a line, which 



