LECTURE XII. 
TT HERE exists a large tribe of animals to which 
we have as yet paid no attention. These animals 
are, in common language, termed Worms, and 
constitute a particular division of the Order Veivnes 
in the Linniean arrangement. Their forms are 
various, and their natures extraordinary. The 
major part of them are the inhabitants of living 
animal bodies ; their introduction into which is 
. one of those inscrutable mysteries which perhaps 
must for ever evade the power of human intellect. 
It is sufficient, at present, to say, that they exist 
in most animals some kinds in the intestines, and 
some in other viscera. I do not mean however to 
pursue their history any further than is merely ne- 
cessary, in order to elucidate the various divisions 
of the Animal World. 
