332 Researches in the Theory and Calculus of Operations. 



The terrestrial magnetic forces are in constant circula- 

 tion through the magnetic meridians traversing the super- 

 ficies of the earth, waters and atmosphere, and the bodies 

 organized or inorganized therein existing. This electro- 

 magnetic movement is in all cases circuitous : circuitous 

 about the globe of the earth ; circuitous around the artifi- 

 cial magnet, and circuitous within the living body which 

 we are presently inquiring into. Cotemporaneously in 

 advance and surrounding the nutrient circuit just indicated 

 (the mucous layer), the coursing magnetic forces concen- 

 trate in the endoderm (serous layer) a nucleus with its 

 nucleolus (germinal vesicle with its spot), at a point deter- 

 mining the head or coronal extremity of the incipient em- 

 bryo, the positive pole, correlating with the pedal or rather 

 the pelvic extremity as negative pole of the system. The 

 coronal pole developes into the brain, the conservator and 

 director of the life of the present individual ; the pelvic 

 pole eventuates in the genital organs, the initiator of the 

 life of the future individual. The two poles communicate 

 through formation of the spinal chord ; while the function 

 of the cerebrum consists in evolving nervous force from 

 the nutrient fluids brought to it by the sanguineous circu- 

 lation. From the brain as a polar central generator of force, 

 when acted upon by sensational or other disturbances from 

 without, currents of liberated force (nervous force) would 

 be incontinently sent forth in circumferential directions. 

 These capillary currents would coat themselves by resisting 

 the action of the medium they traverse, as in the case of 

 the tubes of the sanguiferous circulation ; and as an ad- 

 vance always necessitates a return, so as the advancing 

 arteries antecede the returning veins in the sanguiferous 

 system, do the efferent nerves necessitate the actuality of 

 the complementary aflerent nerves of the sentient system 

 (Hall, Bell). 



