Fig. 70. — Head frequencies of 1/8 pieces of i6-cm. animals reconstituting in strychnine 

 sulphate m/450,000 (continuous lines) and controls (broken lines) ; corresponding experimental 

 and control lots are indicated by numbers 1-4. Values obtained from combined counts in heavy 

 lines; indices as ordinates, body-levels as abscissae (from F. S. Miller, 1937). 



Fig. 71. — Head frequencies of 1/8 pieces of i6-mm. animals reconstituting in water after 

 3 days' exposure to m/300,000 strychnine sulphate; graphed like Fig. 70 (from F. S. Miller, 

 1937). 



