200 MAN AN ADAPTIVE MECHANISM 



have been excised apparently show no hyperchromatism 

 in the brain cells after the injection of strychnin, 

 toxins, foreign proteins, etc. That is, not only is there 

 no adrenal activity in response to activation after the 

 interruption of nerve connection between the brain 

 and the adrenals, but there is also diminished activity. 



DOG 



TOUR/I ipuer 



Crossed Cireulaiion 



FIG. 46. SCHEMATIC DRAWING SHOWING COURSE OF BLOOD STREAMS 

 OF Two DOGS WITH EIGHT-VESSEL CROSSED CIRCULATION. 



The circulation of two dogs were crossed in such a way that the head 

 circulation of one dog was anastomosed to the body circulation of the other, 

 and the body circulation of the first dog to the head circulation of the 

 second. A cord encircled the neck of each so firmly that the vertebral 

 and anastomosing circulation was efficiently blocked. 



Excision of the adrenals causes death on an average 

 within fifteen hours, during which time there is a 

 steady diminution in Nissl substance in the brain-cells, 

 and a steady fall in temperature and a diminution of 

 muscular power to the vanishing point. 



The strong affinity of the brain-cells for adrenin. 



