132 



FRANCIS MARSH BALDWIN. 



first cleavage; in the one case (0.17 vol. per cent.) there is evidence 

 of a slight return of resistance just afterwards, and in the other 

 (0.13 vol. per cent.) there is not. Why there should be this 

 difference in the behavior of the two alcohols is difficult to explain. 

 The exposures to hexyl alcohol were perhaps insufficiently 



PER 

 CEHT 

 OF 



HEFTYL ALCOHOL. 



PLOT OF THE CUHVE OT SUSCEPTIBLE SND RESISTANT FHA3E3 OT THE 

 3EA-ORCHIH COOS WMJ1 SUBJECTED TO 0.07VOL.FER CENT nEFTYL ALCOHOL FOR 1TVE 

 MINUTES AT TO1 MJMUTE INTERVALS BEOINWHG THIRTY MIHOTE3 AFTER rERTTLIZATlOM. 



SURVIVORS. THE PER CEHT OF SORYJVIflG BLASTULAC IS PLOTTED XG/UN3T THE TIME IMTESVAL3. 



USING ran convEnrm<z THE WE or UCH nvr MINUTE FKHIOD. 



100 



90 



80 



50 



40 



\ 







7 





10 





35 



45 

 FIG. 2. 



65 



85 TIME. 



prolonged to bring out a well marked differential effect at the 

 different stages of the cycle. Again, it is well known that certain 

 anaesthetics are less effective than others in suppressing the 

 cell-division process; also many neuromuscular responses react 

 differently to a given anaesthetic in different animals, and in 

 the same animal at different ages. Thus Lillie 1 found chloretone 

 much less effective than chloral hydrate in suppressing cleavage 

 in Arbacia eggs. As regards the alcohols that he tried, he lists 

 propyl, butyl, amyl in the order of increasing favorability, while 



1 R. S. Lillie, Jour. Biol. Chem., 1914, Vol. 17, No. 2, p. 130. 



