"a 
134 STONEY—UNIVERSE OF REAL EXISTENCES.  [April3, 
essential some extension of the meaning of the word vea/—and 
accordingly the exigencies of common life, but more especially of 
scientific inquiry, have made an extension inevitable, so that 
a motion or other part of the Objective Hypotheton is still to be 
regarded as [real]’, although too small or too rapid or in some other 
way unfitted by its time or space relations to be a syntheton of 
human perceptions, whenever justification for this extension exists. 
The objects with which the scientific student of Nature has to deal 
are in fact syntheta of— 
1. Actual perceptions ; 
2. Potential perceptions; and of 
3. Certain ultra perceptions, namely, those which scientific 
investigation does or can warrant. 
By an ultra perception is to be understood what would be a percep- 
tion, if our senses were more acute. 
These are more than the syntheta of actual and potential human 
perceptions which we have called sensible objects, and to distin- 
guish them it will be well to give them a different name. We shall 
call them phenomenal objects. They are in much closer relation to 
what is actually going forward in the autic universe than it is pos- 
sible for the ‘sensible objects’ to be. This is a necessary conse- 
quence of the restricted range of the senses possessed by man, by 
which the amount of detail which can be present in the sensible 
object is limited. 
CHAPTER 17. OF THE DIACRINOMINAL OBJECT. 
Motions are by far the most important part of the phenomenal 
hypotheton, as will be obvious from the following considerations. 
Scientific investigation has brought to light the significant facts 
which are described in common language by saying that men and 
animals receive their sensations of sound from motion in the air, of 
light from events in the ether which can be ultimately analyzed into 
motions, and in the same way their other sensations from motions 
somewhere in Nature. This, put into. less objectionable language, 
is equivalent to the statement that the auta and autic events of the 
sense-compelling universe which produce in me the sensation of 
sound through one channel of communication, viz., through my 
sense of hearing, are such as are also competent to produce in me 
through other channels, namely, through my senses of sight and 
