Show alt ai interesting inari citing irradiation is ii it 11 in virtue of winch which white objects or those of it a very bright color appear larger than they really tire lire when seen acen on oil u a dark ground thus a white square upon a black ground seema larger thau tin an exactly equal black square upon it white ground see sec cut with a black body on a r ay bright g aund the Y converse I 1 ii the s y uw astin again a platinum w wire I 1 r e wasyi ts letl icil hot by the caage pas sigo of nn ail electrical currert seem baina far thicker than it I 1 ia in reality I 1 Iri is i J held to akiso frow rom tile fact that the impression produced 5 on oil the retina 1 extends bei onil the abe outline OK OF irradiation of cr the image it bears the same relation to the frice occupied by the ernane that the duration of the le aion does to the time during which the linask 14 1 4 heen ibe cigert of irradiation is very percenti percept i ble in ill lite apparent of stars mars which inch may thus appear much larger than they really are aso lit the appearance of the moon when n two or three days old the brightly I 1 flu initiated cre crecel ceu t seeming to extend beyond the dirker darker portion of the mid to hold it iu in its grasp plateau who inesti investigated gated this subject found that irradiation differs diller very svery entlich in lil lerent people and even it in tile the same per son nii it differs on oil dif different Terent days lie he also found that irradiation increases with the litter lii ler of the object and the length or of time liine during winch it is i viewed it manifests itself nt at nil all dt tance diverging diller ging tenses lenses ju iu crewse it ou densing lenses lencs diminish it it |