HABIT FORMATION AND FEELING QUALITIES 303 



to our main problem. But here interest is attached to those 

 cards and movements that proved a positive check to speed 

 throughout the major part of the practice. We enumerate 

 them here, 'postponing an explanation to section C. 



The most troublesome cards were the spades, going to dia- 

 mond boxes (plan I). Ranked in order of decreasing difficulty 

 they run as follows 2 of S, K of S, 9 of S, 3 of S, 4 of S, 10 of S. 

 Hearts ranked next to Spades and showed the following order 

 of decreasing difficulty: 5 of H, 3 of H, 9 of H, 10 of H and 7 of 

 H, the latter being comparatively easy; Diamonds came third, 

 in the order: 2 of D, K of D, A of D and 6 of D. (Diamonds 

 were thrown to club boxes). Some of the more difficult clubs 

 were 5 of C and 2 of C. These cards began to attract the sub- 

 jects' attention by reason of their difficulty from the twentieth 

 distribution. The critical movements, not necessarily difficult, 

 originate almost exclusively with the club boxes. This arose 

 from the fact that these boxes were the starting points for two 

 divergent movements; and the difference in the setting of the 

 two movements, starting from the same point, but belonging 

 to different sequences, created confusion, e.g., the two move- 

 ments that delivered the A of C and the A of D respectively 

 start from the J of C. The former occurs in the second and the 

 latter in the third thirteen (plan I, see also diagram 2). 



The following club boxes were regarded as confusion points: 



,AofC /5ofC /lOofC x2ofC 



JofC<T , QofC/ , 3of(X , 8ofC< 



/5 of C /] 



< , 3ofC<( 



A of D \5 of D MO of D ^2 of D 



A of C /9 of D /8 of 



6ofC< , KofC< , 10ofC< 



M of D X 9 of C X 8 of 



An inspection of diagram 3 shows all the essential features 

 and factors creating " critical points" and " critical movements" 

 and shows how inhibitions of movements may arise and persist 

 in the acquisition of skill. The confusion at the 6 of C is aggra- 

 vated in both cases from the fact that the movement to the 6 of 

 C follows the difficult movement to the 5 of H in the one case, 



