362 



D. OGATA AND SWALE VINCENT 



co-vvorkers. The former writer seems to regard a rise of blood- 

 pressure as the normal vasomotor response, while the latter holds 

 a different view. Martin and Lacey's^^ experiments were con- 

 ducted on cats either under brain pithing, decerebration or 

 brain compression, or under ether or urethane. The nerves 

 stimulated were the sciatic, radial, median, ulnar, and saphenous. 

 The results of their experiments were very definite. "In every 

 one of the experiments the stimulation was repeated many 

 times over a range of stimuli from the threshold value to three 

 or four times the threshold. Well-marked drops of pressure 

 followed all such stimulations," save in one exceptional case. 

 Thresholds for pressor reflexes were much higher than those for 

 depressor reflexes. Thus the experiments of these workers 

 support Knoll's statement. 



Our own experiments consisted in stimulating various nerves 

 (sciatic, tibial, peroneal, saphenous, median, ulnar, and vagus) 

 with induction shocks on dogs under ether, chloroform, and 

 brain compression. As to the method, we have to mention that 

 the different effects of weak and strong currents, respectively, 

 were satisfactorily attained by means of sliding the secondary 

 coil up to or away from the primary, but that on many occasions 

 more than one battery was used to obtain a stronger stimulus. 

 The rate of stimulation was 38 to 54 in a second. 



The fall of blood-pressure due to the increased respiratory 

 movements being taken into consideration, the main results of 

 our experiments may be summarized as in the following table : 



The term ' fall' in the table comprises also a fall followed by a 

 rise and 'rise' also a rise followed by a fall. 



