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The fibrous envelope of the adrenal contains connective tissue 
cells, smooth muscle fibres and some nerves and ganglion cells be- 
longing to the adjacent solar plexus which are found principally in 
the dorsal and mesial surfaces of the gland. In addition there is a 
plexus of superficial lymphatics, described first by StirLıne !). In 
digested sections of the dog’s adrenal, the capsule is separated more 
or less into two layers, the outer denser zone consisting of white fibrous 
tissue and an inner zone made up principally of reticulum. From the 
capsule there are two sorts of processes which pass into the gland, 
the large septa (Figs. 1 and 2, s), which extend through the greater 
part of the cortex almost or entirely to the Zona reticularis and the 
smaller septa (Figs. 1, 2, 6), which divide the peripheral part of the 
cortex into irregular oblong or ovoid spaces containing the coiled 
columns of columnar cells that make up the Zona glomerulosa (Fig. 1, 
Z. G.). These spaces average about 0,15—0,2 mm in width and 0,25 
—0,3 mm in depth and are subdivided again, not by a fine fibrillar 
network as ARNOLD and others describe, but by smaller processes of 
reticulum (Figs. 1 and 2, c) which separate the coiled columns of 
cells. When these septa are viewed in the third dimension they might 
be looked upon as membranes running between the cell columns of 
the Zona glomerulosa but if this view is held, they must not be 
considered to be homogeneous membranes, surrounding the “Säulen” 
and “Schläuche” as described by the earlier investigators but as septa 
formed by the intertwining of fibrils of reticulum. The course of 
these fibrils is roughly shown in Fig. 2, while they are seen cut in 
short parallel segments in Fig. 1. It is not improbable that some of 
the larger septa which pass from the capsule through the cortex 
may be contaminated with white fibres from the outer layer of that 
structure. 
The reticulum of the Zona fasciculata in the dog is derived from 
the inner septa of the Zona glomerulosa and the fibrils run towards 
the medulla in wavy parallel lines passing in and out between the 
cells composing it (Figs. 1—4, Z. F.). Besides the isolated fibrils there 
are smal processes running at right angles to the capsule which sup- 
port and maintain the arrangement of the cell colums of the Zona 
fasciculata. From these processes as well as from the larger capsular 
septa, fibrils are constantly given off which run in and out between 
the cells. Preparations made by SPALTEHOLZ’ method, Figs. 1 and 3, 
indicate that there must be a network of reticulum in this layer. The 
1) STILLING, loc. ‘cit. 
