416 M. M. Garver—Sensation and Volition through the Nerves. 
were made under exactly the same conditions. If, however, 
the observations had been taken alternately from hand and 
shoulder, any change in condition would have affected both 
alike, and although the mean time might have increased or 
diminished, the differences would not have <i materially 
affected. It is unfortunate that the order of the observations 
was not stage for then the whole series wold have been 
broken up, and the change, if any, detected. This series will 
be again referred to hereafter. 
Xperiments were also made to determine the relative time 
uired for receiving sensations through the eye and ear. 
Table II exhibits the results obtained from four different 
individuals. 
TABLE ITI. 
Time from Time from Difference in 
Name. “sight to hand.” ** ear to hand.” favor of the ear. 
Lee 01628" + 0011’ 0°1327" +0009" 0301" 
_ 071793" + 0012” 071359" +0019” 0434" 
Gare. oc os 0°1856" + 0015 651" +-0016" 0205” 
Wh ove... eue | 071808" + °0035” 0°1364" +-0020" 0444" 
Hasse 0°1809” + -0018” 9" +-0015" 0370" 
It will be noticed that the time required to hear a sound is 
in all cases less than that required to see a light; and the dif- 
ference is sufficient to allow a sound to traverse a distance of 
light ene from the same 
ear, _ the time registered as in the thie eases. In findi 
” it was necessary to siinrinate 
the soa of the spark, and in order to accomplish this a small 
tube was fitted with platinum wires so as to give a spark 
about an inch in length, and partially exhausted of air. If 
the exhaustion be properly regulated, the spark is sharp and 
distinct, but perfect cctly noisel eae 3 
It would seem that 
experimenters in attempting to determine 
the velocity of nervous transmission, have generally assum 
that under the same circumstances the ra te of transmission is 
constant. us analyze a few series of es hecnpert an 
what light they throw on the subject. 
If the constant, or if the oe of the sre 
maples ~ — elements than those eperine measuring ® 
x 
a curve approximating to that shown in fig. 1, 
well-known curve of probability. And she asilnge it must be 
