298 
IOWA ACADEMY OF SCIENCE Voi,. XXVII, 1920 
by the fact that not all samples of capryl alcohol are uniform in 
chemical composition and purity ; a slight difference in this respect 
is known to make a decided difference in its chemical and physio- 
logical activity. In suitable concentrations, this alcohol is without 
doubt one of the most satisfactory for showing susceptible and 
resistant phases in dividing eggs. Several experiments were 
tried with this alcohol in which the concentration was kept con- 
stant and the time of exposure was varied; and from the data 
thus gathered, it seems probable that of the two factors, con- 
centration is the more important. In other words, if the concen- 
tration is such that it gives the best results with a five minute 
exposure, when the exposure is prolonged to eight minutes, very 
little or no difference is detected. This generalization, however, 
probably could be applied only within narrow limits. 
The data from two experiments using capryl alcohol in 0.035 
and 0.045 vol. per cent concentrations respectively are given in 
Table III. These records are fairly typical of results of other 
experiments. 
When plotted the data give interesting curves as shown below, 
SURVIV0Y5 
CAPRtL y^UCOHOL. 
a PLSr OF C4MVK itHSM USIVO-0.03S AW 0.045 vou PERC£r/T 
t ALCoMot fORFlve MlNt/TE: fitJOSORES AT 5UCCtSVV«TeN 
I 
