70 Siouso City Academy of Science and Letters. 



linked together as cause and effect, that brain secretes - 

 thought as the liver secretes bile. Brain action and men- 

 tal action run parallel to each other, but their paths 

 never intersect. We frequently hear it carelessly said 

 that mind is a function of brain, and Haeckel makes this 

 statement frequently in his books. There is no truth 

 whatever in this statement. Neither brain or mind are 

 functions of the other, although in all our human ex- 

 perience we find them united in the same body. This 

 statement may be new to some, as many suppose mind 

 to proceed in some way from brain as both are found 

 together in all our human experience. The brain is very 

 commonly spoken of as the seat of the mind. I will try 

 and make my statement clear to you and show why mind 

 and brain should never be considered as functions of 

 each other, or either as the cause of the other. Near the 

 middle of the last century scientists discovered and gave 

 to the world two theories which have produced remark- 

 able results in two of the foremost sciences. These two 

 theories were the "Indestructibility of Matter" and the 

 "Conservation of Energy." According to the first, mat- 

 ter can neither be created nor destroyed. It is and has 

 ever been fixed in quantity in the cosmos. It may be 

 changed in form and appearance, but not increased or 

 diminished in quantity. When a lump of coal is burned 

 the ashes and gases arising from combustion weigh pre- 

 cisely what the coal did plus the oxygen which united 

 with it in the burning. The second theory holds that 

 energy or force is also constant in amount. It may be 

 manifested in several ways and can be changed from one 

 mode of manifestation to an other. We know it as heat, 

 light, electricity, chemical action or gravity. It cannot 

 be created nor destroyed, nor can it be changed except 

 in form of manifestation. These two theories have be- 

 come the foundations of chemistry and physics, and are 

 as fully accepted and believed as is the theory of gravi- 

 tation. The theory of the conservation of energy is the 

 one with which we are interested in this paper. It has 

 also been learned by specialists in brain physiology that 

 every thought passing through the mind is accompanied 

 by a molecular change in the cortex or outer part of the 



