98 



ACTIONS OF NARCOTICS 



say, heart muscle, inhibition of cell division, inhibition 

 of ciliary movement, inhibition of respiration etc. Usu- 

 ally a given narcotic substance will produce all these 



c 

 .o 



o 



2 /A 



o / / / 



o / / / 



/ / /c 

 S. -3 / / / 



-2- / //X 



-1 - //// 



0- -^ / 



10 



12 



H 



Fig. 1 8. Some narcotic actions of various primary alcohols. The con- 

 centration of alcohol producing a standard degree of narcosis is plotted 

 against the number of carbon atoms in the alcohol, (a) Inhibition of 

 swimming of tadpoles; (b) inhibition of hog ventricle; (c) concentrations 

 reducing the surface tension of water by lo dynes/cm ;(d) concentrations 

 lethal to B. typhosus; (e) immobilisation of Paramoecium 



effects, but at different concentrations. Fig. i8 shows 

 some characteristic results for the aliphatic primary alco- 

 hols. It will be seen that the different effects are produced 

 by quite different concentrations of alcohol, and that the 

 curves are not even all parallel to one another. From the 

 facts already considered it is improbable that all the nar- 



