SENSIBILITY AND MIND. 85 



any winged articulate, yet no more neural knots about 

 the cephalic extremity of the body or the region in 

 which intelligence is developed or evolved. A pair 

 of ganglia seem to be necessary to work each pair of 

 legs, therefore in a creature like the centipede the 

 ganglia must be numerous. So far as general intelli- 

 gence is concerned the centipede ranks low. The 

 nerve forces of the creature are chiefly devoted to 

 locomotion, and not to the origination and execution 

 of purposes. 



A peculiarity of articulates which have three 

 states of existence, is that in the worm or larva state 

 there are present more pairs of ganglia than can be 

 found in the pupa or chrysalis state, and there are 

 still less pairs in the imago or winged state. While 

 undergoing the various transformations the neural 

 ganglia become aggregated in the head and thorax, 

 while those in the caudal region disappear or become 

 insignificant in size and function. The metamorpho- 

 sis from the voracious worm to a mysterious pupa, 

 and then to a beautiful butterfly either not feeding at 

 all or confining its capricious diet to the most delicate 

 nectars, constitutes the most wonderful of phenomena, 

 especially when it is considered that the volition, 

 " personality," and selfish purposes undergo such rad- 

 ical changes. 



It is said of instinct that its knowledge or intelli- 

 gence extends only to restricted limits, that it admits 

 of a certain range which is measured and bounded. 

 Well, let this be granted ; then endeavor to find out 

 whether animals that possess brains and quite high 

 grades of mental capacities, have given to them un- 

 limited scope for the exercise of their ambitious 

 desires. The white bear and musk ox stick to the 



