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Different Animals, Sec. 483 
than man; although all are infinitely inferior to 
him in intellectual powers. 
All the animals, which have vertebre, have 
the same number of senses as man. ° ; 
2. The animals, which are destitute of}ver- 
tebra, when viewed-with respect to their ner- 
vous systems, may be properly subdivided into 
three orders. : 
The first comprehending the ‘insects and 
some worms; which have a brain, spinal mar- 
row, and nerves, or three parts corresponding to 
these at Jeast. The drain in. these animals: ‘is 
placed above the alimentary canal and sends off 
~ two branches, or legs, which inclose the cesopha- 
gus hke a collar.—The continuation of this, or 
the spinal marrow, 1s situated under’ the alimen- 
tary canal and contained in the same cavity with’ 
the other viscera, It is double, the two legs 
remaining distinct: throughout a great’ part of 
_ their length and being only united, at different 
points, by means of the knots or protuberances, 
from whence the nerves arise, and which are 
nearly as large as the brain. Mr. Cuvier observes, 
that “the gieat sympathetic nerve, which is 
constantly found in all animals with red blood, 
does not exist in any white-blooded animal, 
unless we consider as such the two nervous 
threads, which unite all the ganglions and which ° 
are named moelle épuniere in the crustaceous ani- 
