THE ORGANS OF SENSE 399 



fore-brain, in their early development and evolution, enwrap 

 themselves in their meningeal coverings, and project them- 

 selves, through interstices in the enclosing cephalic wall, 

 into the forming orbital recesses, where they blossom into 

 the future eyes stage by stage, until they culminate in the 

 formation of the most wonderful sense organs known to 

 biological science, in its entire survey of animated nature. 

 In the process of transformation undergone in the adapta- 

 tion, and conversion, of the meningeal coverings of the 

 optic processes for structural purposes, we see the dura 

 mater converted into the sclerotic coat, and the arachno-pia 

 mater into the choroid coat, of the eye, and made suitably 

 supporting, and nutritional, media, for its accommodation, 

 and growth, as well as for the yielding of liquid materials, 

 suitable for the formation, and continual renewal, of its 

 vitreous and aqueous humours, from the inter-meningeal 

 spaces, and their contained cerebro-spinal fluid. Simul- 

 taneously with this meningeal transformation take place the 

 growth, and evolution, of the true nervine textural elements 

 of the optic organism, and the complete dove-tailing of its 

 nervous, and non-nervous, elements, whereby its receptivity 

 of, and susceptibility to, the influence of light energy are 

 finally obtained, together with the meso-blastic interpola- 

 tion, or grafting, of the crystalline lens, and the formative 

 completion of the resulting structure as an organ of 

 sight. 



The evidences of design so abundantly observed in all these 

 developmental phenomena, and the unerring adaptation of 

 means to ends displayed in the formative processes referred 

 to, along with the absolutely equipoised, and effective, 

 exercise of vital energy, truly reveal that the " law of 

 evolution " is but a scientifically convenient name for an 

 intelligence, and power, which it is impossible, and would 

 be puerile, to attempt to ignore. Moreover, we discover 

 here that a great evolutionary event, or perhaps the 

 greatest in the evolutionary history of man, has been 

 wrought, by which the inner man is enabled to look literally 

 out at, and is looked in upon by, the outer world, and has 

 revealed to him the great facts of the existence of two 

 entities, viz. the ego and the non-ego, together with much 

 that goes to make up the sum of human knowledge. 



