CONTROL OF HEAD FORMATION IN PLANARIA 



19 



TABLE IB 

 Oxygen consumption — chloretone 



WEIGHT WEIGHT 



BEFORE TEST AFTER TEST 



OXYGEN CONSUMPTION PER 

 TWO HOURS PER MILLIGRAM 



10/26, '20. 15- to 18-mm. worms. Fed two days before cutting. 3 hr. 20 deg. 



Control 



M. 1/350 



M. 1/350 



Whole animals. 



0.00052 

 0.00018 

 0.00019 

 0.00032 



10/30, '20. 16- to 18-mm. worms. Fed 24 hours before cutting. 4 hr. 20 deg. 



Control 



M. 1/500 



M. 1/500 



Whole animals. 



0.00041 

 0.00026 

 0.00024 

 0.00032 



10/26, '20. 18- to 20-mm. worms. Fed seven days before cutting. 3 hr. 20 deg. 



Control 



M. 1/175 



M. 1/175 



Whole animals. 



0.00044 

 0.00005 

 0.00005 

 0.00030 



10/17, '20. 19- to 21-mm. worms. Fed two days before cutting. 4 hr. 21 deg. 



10/23, '20. 18- to 20-mm. worms. Fed four days before cutting. 4 hr. 22 deg. 



Control 



M. 1/500 



M. 1/500 



Whole animals. 



0.00048 

 0.00044 

 0.00028 

 0.00037 



0.00052 

 0.00040 

 0.00039 

 0.00038 



10/19, '20. 21- to 23-mm. worms. Fed four days before cutting. 4 hr. 21 deg. 



Control 



M. 1/350 



M. 1/350 



Whole animals. 



0.00048 

 0.00030 

 0.00017 

 0.00032 



0.00052 

 0.00025 

 0.00005 

 0.00039 



