REACTION AT 45° AND 90° 353 



Table XXIX. — Excitatory Reaction at Various Angles. 



The ratio of reactions, compared with the ratio of 

 sines, is hence seen to undergo a gradual increase with in- 

 creasing angle of inclination. Thus, to take the two extreme 



Fig. 207. Records of geo electric response at various angles 



( Iropaeolum). 



cases, the divergence between the two ratios at 55^ is 

 2-6 per cent., whereas at 90° it is 9 per cent. This definite 

 divergence, which is persistent in all determinations, points 

 to some physiological difference. 



In attempting to find an explanation of the relatively 

 greater reaction at the larger angles of inclination, it is 

 necessary to take account of two distinct factors in the 



2 a 



