PHASES OF DIVIDING SEA-URCHIN EGG. 



137 



typical experiment using normal octyl alcohol of 0.013 vol. 

 per cent, concentration. For exposures of five minutes duration, 

 this concentration gave the best results, and showed very clearly 

 the resistant and susceptible phases. 



CAPRYL ALCOHOL. 



As mentioned before, experiments with various concentrations 

 of capryl alcohol showed that for brief exposures, the most 

 favorable concentration was nearly three times that of normal 

 octyl alcohol. This may perhaps be accounted for in some 

 measure by the fact that not all samples of capryl alcohol are 



ree wpRn. ALCOHOL. 



CEffT TLOT OF CDHVES HHH1 US1HO 035 and 0.045 TOL. FER CEHT 



OF CJ1PRT1. ALCOHOL FOR FIVE MIHUTB EXPOSURES AT SUCCESSIVE TEN 



SOSVIVOBS. HHHTEE IHTEHFAlS. 



10 



83 TIME. 



uniform in chemical composition and purity; a slight difference 

 in this respect is known to make a decided difference in its 

 chemical and physiological activity. In suitable concentrations, 

 this alcohol is without doubt one of the most satisfactory for 



