è 
upon tbe Stru&lure and Oeconomy of Tania. 249 
and repeatedly voided portions of this Tenia, which were generally 
about two yards in length; fhe voided, at different times, twelve 
of thefe pieces, but none of them had that extreme joint which 
is confidered to be the head. About eight years after her coming 
to England, fhe took the Switzerland medicine, and afterwards the 
head, together with a large portion of this animal’s body, were 
evacuated; fhe then perfectly recovered her health. From the 
foregoing hiftory it is probable that the head of this Tenia 
had exifted for the fpace of twelve or thirteen years; or if fhe 
had voided a head previous to her arrival in this country, we may 
ftill fuppofé the prefent animal to have lived eight years, becaufe 
during this laft period the hiftory was accurately and attentively 
preferved.” i 
It is a curious circumftance in the ačcount of this woman, 
that {he was confiderably relieved from all her uneafy fymptoms 
after voiding each portion of this Twa; but in the courfe of three 
wecks they always returned as before, and were not alleviated until 
fhe voided another portion. May we not account for this by fup- 
pofing that the body of the Tenia was gradually regenerated, after 
each piece, which we have mentioned, had been broken off; and 
that the fymptoms returned and kept pace with the growth of 
the worm; its extenfion along the alimentary canal, and its 
attachments there, proving a fource of irritation proportioned to 
its length ? 
There appearsto be a feries of diftinét fpecies of Tæmiæ,each having 
its peculiar animal, like the Pediculi and Acari. The fpecies of Tene 
are however not confined //sg/y to particular animals. Men are fub- 
je& to feveral different fpecies of them; and even the people of par- 
` ticular countries and climates are fubject to particular fpecies of 
Tente. The people of England have the Tania Solum, and rarely 
Voz. Il. K k any 
