520 Scientific Proceedings, Royal Dublin Society. 



I cannot refrain from adding that, whether we accept the 

 noiimenal hypothesis which is presented above or not, the study of 

 our subject has partly lifted the veil from a spectacle of unsur- 

 passed sublimity. If Nature, the mere shadow, is wonderful past 

 all searching out, what must the great original be ! 



Part Y. — Glossary of Terms. 



Actual, in existence, autic. [Sometimes in contrast with potential, which 

 means, not at present in existence but that can be brought into existence ; 

 at other times in contrast with hypothetical or objective, which see.] 



Aition (plural aitia). For definition see foot-note, p. 490 (see also Diagram 

 III., p. 486). [The aition of a perception, or group of perceptions, is that part of 

 the sense- compelling universe which is the source of those perceptions.] 



Antitheton (plural antitheta). For definition see foot-note, p. 490. 

 "When we are considering a group of our perceptions which we can build 

 together into a phenomenal object, their antitheton means the aition (the source 

 in the sense-compelling universe) which has produced, or can produce, these 

 perceptions in us : their protheton means the phenomenal object made by 

 compacting them together, and by attributing to this structure a non-egoistic 

 existence. 



[Thus, 1° the antitheton, 2° the perceptions in the mind, and 3° the pro- 

 theton, are three terms of a series in which the perceptions in the mind stand 

 between the other two. Each of these perceptions also has its place in another 

 series of a like kind : a perception in my mind, being itself an auto, can act 

 as antitheton if there be any human mind so circumstanced as to be able to 

 receive tekmeria from it ; in other words, if an observer is so placed as to be able 

 to perceive what is going on in my brain while that perception is part of my 

 mind. Here the perception in my mind is an antitheton, the perception in 

 the bystander's mind of what is going on in my brain is the intermediate term, 

 and what objectively occurs in my brain is the protheton.] 



Auto (plural aitia, adjective form autic), what actually exists, in contra- 

 distinction to what only apparently exists (see p. 488). 



Cause- In the latter part of the essay, from p. 510 to the end, cause 

 means efficient cause. In this meaning of the word, causation can only prevail 

 among auta (see p. 510). 



Physical causes are causes conceived of as acting between shadows. They 

 are merely the uniformities of coexistence or of sequence in the events of Nature 

 which can be brought to light by observation combined with the assumption 

 that the future will resemble the past (see § 25, p. 482). 



Cerebration, the autic antitheta o'f the motions or changes of the brain. 



