The principles of psychology . which we see. So that a muscular process inone eye is as likely to combine with a retinal process in theother eye to effect a perceptive judgment, as two processesin one eye are likely so to combine. Another piece of circumstantial evidence for the feelingsof innervation is that adduced by Professor Mach, as fol-lows : If we stand on a bridge, and look at the water flowing beneath,we usually feel ourselves at rest, whilst the water seems in looking at the water, however, commonly has for its resultto make the bridge with the observer and surround
The principles of psychology . which we see. So that a muscular process inone eye is as likely to combine with a retinal process in theother eye to effect a perceptive judgment, as two processesin one eye are likely so to combine. Another piece of circumstantial evidence for the feelingsof innervation is that adduced by Professor Mach, as fol-lows : If we stand on a bridge, and look at the water flowing beneath,we usually feel ourselves at rest, whilst the water seems in looking at the water, however, commonly has for its resultto make the bridge with the observer and surroundings suddenly seemto move in the direction opposed to that of the water, whilst the wateritself assumes the appearance of standing still. The relative motion ofthe objects is in both cases the same, and there must therefore be some lies. The open eye remaining fixed, and the closed eye moving towardsthe right or left, the object seen by the open ej-e appears also to move to-wards the right or left. (Physiol. Optik, pp. 607-8.). 512 PSYCHOLOGY. adequate physiological ground why sometimes one, sometimes the otherpart of them is felt to move. In order to investigate the matter con-veniently, I had the simpleapparatus constructed whichis represented in Fig. 86. Anoil-cloth with a simple patternis horizontally stretched overtwo cylinders (each 2 metreslong and 3 feet apart) and keptin uniform motion by the helpof a crank. Across the cloth,Fig- 86. QT^^ some 30 cm. above it, is stretched a string, with a knot a?, which serves as a fixation-point forthe eye of the observer. If the observer follow with his eyes thepattern of the cloth as it moves, he sees it in movement, himself and thesurroundings at rest. But if he looks at the knot, he soon feels asif the entire room were moving contrary to the direction of the cloth,whilst the latter seems to stand still. This change in the mode oflooking comes about in more or less time according to ones momentarydisposition, but usually it takes
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpsychology, bookyear1
