CONTROL OF HEAD FORMATION IN PLANARIA 



27 



TABLE 5A 

 Head frequency — ethyl alcohol. In -per cent 



6/28, '17. 18- to 20-nim. worms. Fed three days before cutting 



Control. 



1. M. 1/10. 



Control. 



2. M.1/10. 



3/8, '21. 17- to 19-mm. worms. Fed eight days before cutting 



TABLE 5B 

 Oxygen consumption — ethyl alcohol. 



OXYGEN CONSUMPTION PER MILLIGRAM 

 PER TWO HOURS 



First two hours 



Second two hours 



Control. 

 M. 1/10. 



Average oxygen eonsumption per two hours 

 First ten hours 



0.00047 

 0.00058 



