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or more nucleoli, but no pigment granules. These cells pass by quick 
transition into the cells of the inner layer which resemble them except 
in size and in possessing a coarse closely packed protoplasmic net- 
work, that gives them a dense appearance exhibited by the cells of 
the outer layer. 
The Zona reticularis consists of small polyhedral granular nu- 
cleated cells closely packed together, in a somewhat irregular manner. 
They are also devoid of pigment. 
The Medulla. The centre of the organ appears to consist of 
irregularly folded columns of cells arranged around centrally placed 
arterial capillary blood vessels, and surrounded by venous sinuses. 
There does not appear to be any special connective tissue sheath 
surrounding the columns or cords, sending in septa to divide them 
Venous sinus of medulla, surrounded by columnar cells. a Granules in cell. 5 
Granules in sinus. c Centrosomes. 2 Invaginated cup-like body. n Nucleus of endo- 
thelial cell of sinus wall. r Red blood corpusele s Secondary nucleus? » Venous 
sinus. 
Drawn with Abbe’s camera lucida under the il, th Oil Immersion lens and 
apochromatic eye-piece No. 4, Zeiss. 
into loculi as has been described by some authors, though specimens 
prepared in the usual way appear to warrant such a conclusion; 
almost the only connective tissue present belongs to the walls of the 
various vessels situated in this region. 
Each cell of these columns is irregularly columnar in shape, of 
very delicate structure, and possesses one or more spherical nuclei 
deeply placed in the end of the cell nearest to the blood capillary. 
The cell wall is of extreme tenuity, being in some cases hardly visible, 
