Mathematical recreations and essays . n most of the figuresdescribed below it is immaterial whether we begin with Opening A or Opening B. Movement T. There is also another movement which ismade in the construction of many of the figures and whichmay be described once for all. This movement is when we have on a finger two loops, one proximal andthe other distal, and the proximal loop is pulled up over the distal loop, thenover the tip of the finger, and then dropped on the palmar side. I term this theMovement T. A Door. The first example I will give is a Door—seefigure V—which comes from the Ap
Mathematical recreations and essays . n most of the figuresdescribed below it is immaterial whether we begin with Opening A or Opening B. Movement T. There is also another movement which ismade in the construction of many of the figures and whichmay be described once for all. This movement is when we have on a finger two loops, one proximal andthe other distal, and the proximal loop is pulled up over the distal loop, thenover the tip of the finger, and then dropped on the palmar side. I term this theMovement T. A Door. The first example I will give is a Door—seefigure V—which comes from the Apache Red Indians. Itaffords a good introduction to the Oceanic Varieties, for it isone of the easiest figures to construct, as the movements aresimple and involve no skill in manipulation. The rubbing thehands together in the final movement has nothing to do withthe formation of the figure, though it adds to its effectivepresentation. The diagram represents the final figure held ina horizontal plane. CH. XVIIl] STBING FIGURES 359. Figure v. A Door, The Door is produced thus (Jayne, pp. 12—15). First. Take up the stringin the form of Opening A. Second. With the right thumb and index lift theleft index loop off that finger, put it over the left hand, and drop it on the leftwrist. Make a similar movement with the other hand. Third. With the dorsaltip of the right thumb take up the near right little-finger string, and a similar movement with the other hand. Fourth. With the dorsal tipof the right little-finger take up the far right thumb string, and return. Make asimilar movement with the other hand. Fifth. Keeping all the loops in positionon both hands, with the left hand grasp tightly all the strings where they crossin the centre of the figure, and pass this bunch of strings from left to right betweenthe right thumb and index ( from the palmar side to the back of the hand), andlet them lie on the back of the hand between the thumb and finger. Next withthe le
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