On the Vasomotor Nerves of the Stomach. 69 



ncsium the direct irritability soon returned, but not the indirect. 

 However, when now the perfusion of calcium chloride followed, 

 the indirect irritability recovered also and quite rapidly. The 

 meaning of these experiments seems to be simply this : magnesium 

 depresses the direct irritability as well as the indirect, the latter, 

 however, somewhat more effectively than the former. Sodium 

 restores the depressed direct irritability and when used alone, exerts 

 no effect upon the indirect irritability. Calcium alone helps neither 

 the direct nor indirect irritability but when it follows sodium (or 

 when given with sodium) it restores promptly the indirect irrita- 

 bility. We can now interpret satisfactorily the results of the lymph 

 sac injections. In these intact animals sodium chloride is present 

 in sufficient quantity in the blood to prevent the depressing action 

 of the magnesium upon the direct muscle irritability and, further- 

 more, the accumulated quantity of the sodium is still sufficient to 

 assist the subsequent injection of the calcium in the restoration of 

 the indirect irritability. In this connection we may also suggest 

 further that even the striking antagonistic results obtained by Auer 

 and Meltzer with calcium in mammals might not be due to the 

 calcium alone but to the combination of the injected calcium plus 

 the sodium present in the serum. 



The last mentioned facts are an instructive example of the dif- 

 ference in the results obtained by injecting into an animal with in- 

 tact circulation and by perfusion of bloodless organs, a difference 

 which is not always kept in mind by many experimenters. 



40 (450) 



On the vaso-motor nerves of the stomach. 

 By R. BURTON-OPITZ. 



[From the Physiological Laboratory of Columbia University, .] 



In order to demonstrate the existence of vaso-motor nerves in 

 the stomach, the following method was resorted to : Quantitative 

 measurements of the vascularity of the stomach were made by 

 means of a stromuhr; while at the same time attempts were made 

 to vary the normal bloodflow through this organ by means of 

 stimulation of the splanchnic nerves. 



The stromuhr was inserted in the vena gastro-lienalis between 



