PHYSIOLOGY: A. G. MAYER 
271 
Table I shows the results of the observations of 1914, the probable 
errors being expressed as =±= following the mean. Thus 100.5 0.67 
means that the average rate was 100.5 with a probable error of =±= 0.67. 
As the table is based upon 373 observations, the probable errors are 
on the whole low for physiological results and are not greater than 1.62%. 
• 
0.866 
-I. - o.s 
z 
OS. 
10 
Tevcent 
^0 
SO 
of dilation. 
If Cs be the velocity of nerve conduction corresponding to any per- 
centage of diluent x (thus in 75 volumes of sea water mixed with 25 vol- 
umes of distilled water, x = 25), then 
Cs = 100 - 0.123 X'-' 
But a more interesting relation exists which may throw new light 
upon the nature of nerve conduction, for it appears that the curve rep- 
resenting the velocity of nerve conduction is identical in form with 
that for adsorption. 
Past experiments show that the rate of nerve conduction in Cassiopea 
depends upon the concentration of the cations sodium, calcium, and 
potassium, and not upon osmotic pressure or upon magnesium. This 
