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Updated: May 11, 2025
So, while the artistic tendency may be a universal nervous system, artists are inclined to ganglionate. The nerve-knots vary in size and importance, and one chief ganglion may serve as a feeding brain, but it cannot monopolize the activity. In America, particularly, these ganglia, or colonies, are an interesting and vital phase of our development.
On examining the arrangement of the parts within, we find the nervous cord, consisting of two chains of swellings, or nerve-knots, resting upon the floor or under side of the body; and the heart, or dorsal vessel, situated just under the skin of the back; and in looking at living caterpillars, such as the cut-worm, and many thin-skinned aquatic larvæ, we can see this long tubular heart pulsating about as often as our own heart, and when the insect is held against its will, or is agitated, the rapidity of the pulsations increases just as with us.
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