SYSTEMATIC SYNTHESIS OF APP. INTO GROUPS. 397 



half of the left eye extend across to the right, interweav- 

 ing with each other at 3, the commissure. 



1308. THE NERVES, THEREFORE, COMMENCING IN 

 THE RIGHT HALF OF EACH EYE, connect with the right 

 ganglion, 4, and those commencing in the left half of 

 each eye, connect with the left ganglion, 4. 



1309. Remark, Objects on the right affecting the nerves in the 

 left half of the eyes, cause sensations through the left ganglion, and 

 objects to the left of the eye excite sensations through the right gan- 

 glion. But if an object is coming from the right, and must be warded 

 off by the right hand, how is it to be done ? 



1310. THERE ARE ALSO NERVES communicating BE- 

 TWEEN the right and left ganglia, and extending from 

 the right motory ganglia across into the left spinal cord, 

 and from the left ganglia into the right side. 



1311. Remark. Thus, if an object threatens from the right, the 

 light from it affects the left side of the eyes, and a sensation is caused 

 through the left ganglion, that at the same time causes an action across 

 to the nerves influencing the muscles of the right side, and thus WARDS 



OFF THE" DANGER. 



1312. lllus. A MAN MAY HAVE PARALYSIS of some parts upon one 

 side, and at the same time of parts on the other influenced by the same 

 nervous centres. A person may, by disease, as is frequently the case 

 in " blind headache," be unable to see more than half an object, if on- 

 ly one ganglion is affected ; if the right half is dark, the left ganglion is 

 affected. There is a more remote cause, however, than disease of the 

 ganglion, such as indigestion or nervous exhaustion, or both together : 

 generally, rest is the only remedy. This condition sometimes seems to 

 be produced by the weather perhaps its electrical conditions. 



1313. It IS THEREFORE LITERALLY TRUE for the HlOSt 



part, and ideally wholly so, that the Mind is served by 

 double sets of apparatus, while in every sense the Blood 

 is made by single sets of apparatus. It is also certain 

 that the double sets serving the Mind are so intimately 

 related to each other, and so associated, that in health 

 there is a perfect unity of mental action produced by and 

 through them. 



1308. What said of ? 1310. Where are ? 1312. How may ? 1313. What 

 is ? 1314. What found ? 1315. What do ? 1316. What conclusion reached ? 



