112 JOUENAL OF THE MiTCHELL SoCIETY [^ApvU 



Professor Abel, Dr. Rountree and Dr. Turner demonstrated 

 an apparatus for " Vividiffusion." 



The apparatus consists in a large glass cylinder in whicli is a 

 series of celloidin tubes. Surrounding tbe celloidin tubes dif- 

 ferent diffusion fluids maj be used; salt solutions of different 

 strength or glucose solutions. The celloidin tubes which are 

 dialyzing tubes are attached at their ends to glass tubes. The 

 latter are connected by rubber tubing with the animal used in 

 the experiment. 



An animal, preferably a dog, is anesthetized and glass canulas 

 are placed in the caroted artery and jugular vein. The canula 

 from the artery is connected with the intake tube of the dif- 

 fusion apparatus and the canula in the vein is connected with 

 the remaining glass tube which leads from the diffusion ap- 

 j)aratus. By such a scheme blood passes from the animal 

 through the arterial canula into the celloidin dialyzing tubes, 

 through these tubes and back into the animal through the 

 canula in the jugular vein. 



In order to prevent the blood from clotting during the time 

 it is in the celloidin tubes a solution of hirudin (leech extract) 

 is injected into the arterial canula. 



The use of such an apparatus opens a new field in the study 

 of metabolism of the body in general, in the study of the meta- 

 bolism of isolated organs, and in the removal from the body of 

 a living animal of various toxic bodies. Used in the latter 

 sense the apparatus will likely serve as a valuable therapeutic 

 agent. 



The demonstration by Dr. Meltzer and Dr. Gates consisted 

 in showing the antagonism which exists between the salts of 

 magnesium and calcium. 



A rabbit was anesthetized by injecting a solution of mag- 

 nesium salts. The anesthesia was profound. An injection of 

 calcium salts was then made into the lateral ear vein of the 

 animal. Within a very few seconds following the inject 'on, 

 consciousness had completely returned, the animal appearing in 

 all resj)ects normal. 



The scientific communications presented at the meetings of 



