NATURAL HISTORY MISCELLANY. 215 
cysts varying in size, from 1-30th to 1-60th of an inch in length, and 
1-100th to 1-150th of an inch in thickness ; thirty-five thousand of these 
have been counted in a single cubic inch of muscle, and it has been . 
estimated that an ounce of such flesh would T three million 
cysts. Within them may be seen coil- 
ures. (Fig. 1, the young worm; and Dee 
Fig. 2, the cysts, after Dalton. ) If now Trichina spiralis. ay ay about 
such hie is eaten by man, the one hundred tim 
are dissolved during digestion, tes a young worms, unless pre- 
the development of the embryos is from four to 
eight days, after which they begin to leave the 
oviduct in the form of exceedingly small, trans- 
parent worms. They may continue to be dis- 
charged in immense numbers, however, for six 
t 
velopment of the whole number of ova; from three 
d to 
mediately after birth the young leave the resi- 
dence of the adults, the intestinal canal, and give Trichina spiralis, in cysts, 
rise to the first symptoms indicative of their from muscular tissue 
Presence. They bore into the intestinal walls, Ham. Magnified. 
and wander along the areolar tissue, penetrating to nearly all parts 
of the muscular system. - Entering the primitive bundles of this tis- 
“Wandering begins immediately after birth, but it may be several weeks 
before the whole brood has found its final resting-place. In this qui- 
