Different Animals, €&e. 477 
Vermes. As there is a general resemblance in 
the nervous systems of the animals, referred to 
each of these great divisions, particularly the 
former, I find it convenient to adopt them here. 
1. The nervous system of man and other 
animals, included in the first division, is more 
extensive and complicated than in insects and 
worms. Viewed with respect to its situation, 
it consists of three primary parts, namely, the 
Encephalon, Spinal Marrow and Nerves. The two 
former have been considered as constituting the 
common trunk, the Jast as the branches of the 
system. 
The ENCEPHAEON, which is so named from 
being seated in the head, is subdivided by an- 
atomists into three principal parts, the cerebrum, 
or brain strictly so-called, the cerebellum and 
medulla oblongata: But for brevity and to avoid 
the unnecessary use of technical terms I shall, 
in general, speak of these three parts collectively 
under the title of drain, taking care to guard 
against ambiguity, when- it becomes necessary 
to mention any of the three parts distinctly from 
the others. It may not be improper to state 
here, that in those animals, which have no skull, 
and therefore, strictly speaking, no encephalon, 
that portion of the nervous system, which is the 
most bulky and occupies the highest, or fore- 
most place, will be named brain, since this 
