STEREO-CHEMISTRY AND PHYSIOLOGY 481 



of further data as to the action of stereo-isomers upon animal 

 tissues is very desirable. Since a slight difference in structure 

 may produce a great difference in the action of drugs, it seems 

 advisable to begin by investigating those cases in which the 

 structures of the bodies are identical, and the only difference 

 lies in the special arrangement of the atoms. At the present 

 time the data in this branch of the subject are only sufficient to 

 show that the influence of stereo-isomerism is of importance ; 

 they are not full enough to enable us to draw any general 

 conclusions. 



