slow fast fast slow fast slow fast slow fast slow slow fast m. to m. to m. to m. to m. to m. to m. to m. to m. to m. to m. to m. to lft. rt. lft. rt. lft. rt. lft. rt. lft. rt. lft. rt. .29 .78 .76 .45 .43 .68 .03 .06 .06 .05 .1 .15 .04 .16 .2 .45 .43 .23 .05 .1 .1 .06 .1 .11 .25 .38 .33 .4 .38 .36 .15 .08 .11 .08 .06 .08 .3 .58 .56 .58 .56 .35 .05 .06 .06 .06 .06 .06 .33 .78 .78 .58 .56 .38 .05 .08 .1 .08 .08 .05 .28 .71 .71 .35 .35 1.78 .11 .08 .06 .05 .06 .06 .41 .46 .45 .51 .5 .06 .05 .06 .06 .05 .43 .56 .58 .6 .61 .11 .06 .06 .08 .1 .35 .33 .31 .73 .68 .05 .1 .1 .06 .06 .23 .86 .86 .15 .08 .08 .38 .21 .21 .1 .06 .05 .43 .8 .81 .11 .08 .08 .38 1.53 1.58 .03 .06 .05 .53 .2 .23 (.18) .36 .03 .23 .06 .45 .11 .25 Averages .26 .08 .07 .45 .07 .45 .08 .50 .08 .49 .58 .08 Parentheses indicate time during which the eye did not move at all. [Illustration: PLATE II. Fig. 5] Table II gives in detail the data yielded by four of the most instructive films. C 3 is the longest record that was obtained; Tu 4 is among the shortest, though it is not the very shortest. H 2 and H 3 show how nearly alike are the simultaneous movements of the two eyes: .07 sec. is the greatest difference recorded on any film between simultaneous movements. All four records show how much less the duration of the slow movements is at the beginning of the record than at the end, and how little the fast movements vary in this respect.