630 



EAYJMOND PEA EL. 



tliis seems paradoxical. The beliaviour v/as as follows : — A 

 large diffusion area Lad beeu formed^ and a specimen was 

 stimulated to a weak positive reaction at a distance of about 

 twice its own length from the food (Fig. 29, 1). It passed 

 into the diffusion area, but did not give another positive reac- 



N 



B 



Fig. 29. — bliowiiig tlic react ion of a ]ilanaiiaii to a very weak food 

 stiiiiulus. Lclters as in Tig. 2S. 



tion when opposite the fuud, but instead glided by and away 

 from it. When it had gone some distance in this direction 

 it st(»pj)ed and gave a very clear and cluiracteristic positive 

 I'eaction, so far as the form ol the reaction indicated, but 

 with the turn away from instead of towards the centre of 



