_x* 





Fig. 2-2. Neurosecretory cells, with axons cut short, from the 

 suboesophageal ganglion of the cockroach, Leucophaea maderae. 

 The differences probably correspond to phases in a secretory 

 cycle : (A) laying down fine granules in the cell-periphery in the 

 position of Nissl bodies at the onset of secretion ; (B) abundant 

 larger granules passing into the swollen axon above; (C) empty 

 vacuoles replacing secretory droplets; (D) an almost empty cell 

 body, with only a few granules left at the base of the axon. The 

 cycle then probably starts again at (A) ; but the sequence has not 

 yet been proved. Cells, X 320, fixed in Zenker-formol and stained 

 in Masson (from Scharrer and Scharrer, 19546). 



