254 3 - Mn. CARLISLE' Obfervations 
- 
tion*. Teenie have no particular organs of fenfe; the fenfe of touch 
istherefore the only evident fource of intelligence which they poffefs. 
"The mode of increafe or propagation of thefe animals appears 
to be principally by ova. Linnæus and many other naturalifts 
{peak confidently of the ova of Z«wiz, mentioning their fhape, 
fize, &c.; but I have never feen any thing like eva, which I could 
decidedly fay belonged to thefe animals, excepting fome globular 
bodies, which I faw by a powerful magnifying glafs, in the ducis 
that open into the lateral ofcula; fee fig. 6. ‘There is every reafon 
to believe that Tæniæ produce ova, and that their ova, as well as thofe 
of other inteftinal worms, are fo conftruéted as to be very little pe-. 
ruhable. From this circumftance they may país along the cir- 
culating veffels of other animals, without having their lives de- 
ftroyed. We cannot eafily explain the plidbostena of worms be- 
ing found in the eggs of fowls, and in the inteftines of a foetus 
before birth, except by fuppofing their ova to have paffed through 
the circulating vefléls of the mother, and by this means been con- 
veyed to the foetus.. 
The openings in the edge of each joint — the body of 
the Tenia Solium, are fometimes placed alternately on the oppofite 
fides, and at other times are placed on the fame fide for three, four, 
or even five fucceflive joints. Thefe openings, which have been called 
ofcula, are little concave, fhallow cups, formed by the projection 
of the furrounding edges, which are thickened like lips; at the 
bottom of thefe cups there is a {mall opening leading into a canal, 
* After I had written this effay, T learned that Mr. Hunter has entertained a fimilar 
opinion to that which is now ftated, and which he applies to many of the lower tribes of 
animals. I alfo underftand that he has adduced fomething fimilar to this in his le&ures ; 
and as I have attended thofe lectures, I cannot fay that fuch hints (although at prefent 
doit to my recollection) may not have given rife to the opinion here adduced. 
7 which 
