248 Mr. CARLISLE’s Obfervations 
where there is the greateft abundance of chyle, which feems to 
be the natural food of Tenia. ( 
. It does not appear that Tew are calculated to live in any 
other fituations than living animal fubftances. — That thefe 
worms fhould be created for the purpofe of producing difeafe in 
the animal which they inhabit, is abfurd; it would rather feem 
. that nature has not intended any fituation to be vacant, where it 
was poffible to carry on the work of multiplying the fpecies of 
living beings. By allowing them to live within each other, the 
fphere of increafe is confiderably enlarged. "There is however little 
doubt that worms, and more efpecially the Zeniz, do fometimes 
produce difeafed ftates of the bodies which they inhabit; and we 
are alfo well affured, that worms do exift abundantly in many 
animals without at all difturbing their fun&ions, or annoying them. 
in the fmalleft degree. - 
Some difeafed ftates of animal bodies are highly favourable to 
the increafe of worms; as dropfy to that of hydatids, and the 
rot in fheep to that of the Fa/ciola hepatica, &c. But, in thefe in- 
ftances, worms are rather to be confidered as concomitants of dif- 
eafes, than a fource of them.. When Zzziz have arrived at fome 
confiderable growth, it appears that they always produce difeafed 
affe&ions. With refpe& to the probable duration of thefe animals 
lives, Mr. Hunter has given me permiffion to make the following 
extracts from a very curious nior of a Tenia which is preferved 
in his collection. 
« Marian Burgoïn, a native of Laufanne in Switzerland, at the 
age of fourteen years, was affected with pains in her ftomach and 
head, rigors, &c.; thefe fymptoms continued and were gradually 
. increafed, At the age of nineteen fhe came to England, and was 
. Advifed to take purging medicines, by which fhe voided a portion 
-of Tenia lata. She continued for fome years to take draftic purges, 
a and 
