590 THE POSTERIOR PITUITARY AND THE NERVOUS SYSTEM. 



and Berkley, the engorgement caused by poisons affects the 

 three upper layers of the cortex most markedly. The bead- 

 like swellings of the first-layer dendrites are well shown in the 

 annexed illustration, the lesions being those found in alcoholic 

 insanity. The second layer and third layer are represented 

 by the plate opposite page 550, reproduced from Berkley's 

 article, ricin poisoning, as previously stated, having been the 

 cause of the cerebral engorgement. The cells of the last, or 

 fourth (polymorphous), layer are not represented in the series 



TERMINAL TUFTS AND ENDINGS OF THE PROTOPLASMIC APICAL PROC- 

 ESSES IN THE FIRST LAYER (HUMAN BRAIN-CORTEX). 

 (Andriesen. ) 



Showing bead-like and moniliform swellings, coalescence of fine 

 miliary granules in place, and loss of fine granulation in the most af- 

 fected parts. The dotted line marks the limit between the first and second 

 layers. Alcoholic insanity. 



of illustrations, but the fact that Marchi found that the epen- 

 dymal neuroglia-cells sent a central extension to the optic 

 thalamus, where it divided and became attached to the blood- 

 vessels, represents but one of many examples which could be 

 adduced to show that the circulatory system as we view it is 

 that of the entire cerebro-spinal system, including the organ 

 which governs the supply of blood to all tissues: i.e., the poste- 

 rior pituitary body. 



