i o Sir Everard Home on the internal structure, &c. 
upward to the muscles of the tongue, beyond which are the 
glands of the mouth, and the oesophagus cut through. 
This nerve, so similar to the recurrent in the human body, 
only differing in being single, justifies me in having given the 
name of spinal marrow to the part that gives it off. 
Fig. 10. The point of one of the large horns, magnified 
fifty diameters ; to show that the external point of its termi- 
nation in no respect resembles a cornea, but consists of five 
bundles of nervous filaments, the terminations of the branches 
of the nerve. 
Plate II. 
Fig. 1. The brain, spinal marrow, ganglions, and nerves 
of the moth of the silk-worm ; magnified ten diameters. 
Fig. 2. The same parts in a large caterpillar ; magnified 
four diameters. 
Fig. 3 . The same parts in the lobster; natural size. 
Fig. 4. The same parts in the earth worm ; magnified 
two diameters. 
Fig. 5. The upper part of the same earth worm ; mag- 
nified eight diameters. 
In Fig. l, 2, 4, and 5, the ganglions, as well as the brain 
and spinal marrow, are upon too small a scale to admit of 
accurate examination, but in a large lobster, the distinction I 
have made between the brain and spinal marrow and the 
ganglions, was satisfactorily confirmed, and even in the earth 
worm it was sufficiently distinct. 
