404 



MEMOIRS OF THE NATIOISTAL ACADEMY OF SCIEXCES. 



tlie right foot to ^l and M were made by two observers, D aud ( '. The reactions were made in 

 series of ten, the order of the series being- altered each day. The results of the sets of one 

 hundred reactions, together with the mean A^ariations of the ten series which made up the set, 

 are given in the first part of the accompanying table. In the second part of the table are given 

 the ditferences obtained by comparing the times for the several points of application of the 

 stimulus and the two movements. Following the table are some further explanations, which to a 

 certain extent apply to all the tables. 



Taule I. — Iieactkiii-liines on electrical stimiilntion on four points of the hody. Morement icilh hand and irith font. 



D and C observers. 6,360 reactions. 



Movement with band. 



Upper arm. 



131.3 



166 



153.4 



148.4 



149.1 



o.i' 

 5.B 

 4.9 



149.6 



110.4 



108.7 



109.6 



120 



116.7 



6.8 

 S.i 

 1.5 



3.2 



Lower arm. 



132 



189 



167.8 



160.3 



170 



10.0 



11.2 



7.1 



.5.9 



4.1! 



Upper leg. 



140.8 



197 



179.3 



176.8 



170.3 



IS.S 



14.4 



7.6 



103.8 



115.5 

 116.4 

 115.8 

 128.4 

 120.1 



!.a 



8.5 



i.ri 



4.S 

 5.1 

 4.7 



1(4.6 8. 8 



113.1 3.1 



119.; 



127.5 

 139. 7 

 139.2 

 143.2 

 148. 7 ' 



6.S 



S.7 



4.e 

 S.5 



139.7 



Lower leg. 



143. 1 11. 1 



215.7 21.-2 



201.3 10. 1 



197. 5. 8 



196 6. 8 



190.7 11.2 



125.6 

 150.4 

 149.6 

 154.5 

 156.6 



8.2 

 4.7 

 5.4 

 6.5 



147.3 6.6 



"With foot. 



Lower arm. j Lower leg. 



157.3 

 226.2 

 208 5 

 206.3 

 209.2 



14. S 



32. S 



4.9 



6.6 

 4. 7 



170.1 

 248.1 

 221. 6 

 230.3 

 232 



16. S 



IS. 3 



10.4 



5.6 



201.5 13.6 220.4 11. 



161.4 

 162.9 

 173.7 

 190.3 

 179.7 



5.9 

 8.4 



4.2 



173.6 6.6 192.3 



166.2 

 163.6 

 212. 9 

 215 

 203.8 



9.S 



5.3 



Lower arm less upper arm. - . 



Lower leg less upper leg 



Upper leg les.s upper arm 



I.iiwer leg less lower arm 



Lower leg (foot) less lower 



arm (foot) 



Lower arm (foot) less lower 



leg 



Lower leg (foot) less lower 



leg 



Lower arm less upper arm. . . 



Lower leg les.s upper leg 



Upper leg less upper arm 



Lower leg less lower arm 



Lower leg (foot) less lower 



arm (foot) 



Lower arm (foot) less lower 



arm 



Lower leg (foot) less lower 



leg 



II. 



0.7 

 2.3 

 9.5 



11.1 



12.8 

 25.3 



27 



5.1 



—1.9 



17.1 



10.1 



4.8 



45.9 



40.6 



23 

 18.7 

 31 

 26.7 



21.9 



37.2 



32.4 



7.7 

 10.7 

 31 

 34 



.7 



46.5 



13.2 



III. 



14.4 

 22 

 25.9 

 33.5 



13.1 



40.7 



20.3 



6.2 

 10.4 

 29.6 

 33.8 



39.2 



57.9 



63.3 



IV. 



11.9 

 20.8 

 28.4 

 37.3 



24 



46 



32.7 



8.4 

 11.3 

 23.2 

 26.1 



24.7 



61.9 



60.5 



T. 



20.9 

 16.7 

 30.2 

 26 



36 



3.4 

 7.9 



32 



36.5 



24.1 

 59.6 

 47.2 



14.2 

 16.1 

 25 



26.9 



18.9 

 37.7 



29.7 



6.1 



7.7 



26.6 



28.1 



18.7 



54.4 



45 



Av. Av. 



15.1 



23.6 



33.; 



\ 6.9 



24.5 



49.7 



The first set of 1,360 experiments was made iu the winter of 1890. The experiments were then interrnpteil, 

 owing to change of resilience, until the summer of 1892. 



In the first set 13 reactions were made iu a series, aud each time iu the table is the average of 130 

 reactions. In the remaining sets and iu the following table each time is the average of 100 reactions. In the tirst 

 set ou C aud iu all the sets ou D tlie reactions were measured singly. In the last four sets on C. 10 reactions were 

 made iu succession, aud only the resultant time recorded. In sever.al cases, owing to inadvertence or the occurrence 

 of times which could not be reaction-times, there was one reaction too few iu a series. Premature reactions scarcely 

 ever occurred, not once in 100 reactions. In the first set the electrodes were 5 mm. apart. In the remaining sets the 

 electrodes were on opposite sides of the limb for D. In the case of C, one pole was conducted through salt water to 

 the left foot. 



The time is giveu in thousaudths of a second. .A^fter the time of reaction the mean variation of the separate 

 aeries from the average time of the 10 series is given in italics. This multiplied by 0.845 and divided by v'lO would 

 give approximately the probable error of the average of 100 experiments. 



