3l8 HISTOLOGY 



of walls, a single layer cf endothelial cells. A minor difference is that 

 the cell mass is divided into smaller cords and plates which are in con- 

 tact with a plexus of sinusoids instead of with a few larger sinuses 

 (Fig. 286). 



Technic. The procedure for securing specimens of these tissues is 

 simple, and demands but one detail, the use of some salt of chromic 

 acid or of chromic acid itself in the fixative or hardening reagent. This 

 insures the peculiar dark brown appearance of the chromafrine cells 

 from which they have taken their name. The use of Flemming's fluid 

 or of Zenker's fluid is thus indicated and gives the best results. Much 

 of the work that has been done on these tissues has been done with 

 Miiller's fluid. Such work has been unsatisfactory in all details except 

 as to the differentiation of the chromafrine cells. 



LITERATURE 



BERKLEY, H. J. "The Nerve Elements of the Pituitary Body," Johns Hopkins Hospital 



Reports, Vol. IV, 1895, p. 285. 

 KURSTEINER, W. "Die epithelial koperchen des Menchen," Anat. Heft, Band XI, 1898, 



S. 391. 

 GOODALE, J. L. "The Endothelial Phagocytes of the Tonsilar Ring," Journal of Medical 



Research, Vol. VII, 1902, p. 394. 

 KOHN, A. "Studien iiber die Schilddruse," Arch. f. mik. Anat., Band XLVIII, 1897, 



S. 398. 



WELSH, D. A. "Concerning the Parathyroid Glands," Journal of Anatomy and Physi- 

 ology, Vol. XXXII, 1898, pp. 292, 380. 

 SCHAPER, A. "Zur Histologie der Glandula Carotica," Arch. f. mik. Anat., Band XL, 



1892, S. 287. 

 WALKER, J. W. T. "Uber die Menschliche Steissdriise," Arch. f. mik. Anat., Band 



LXIV, 1904, S. 121. 

 VINCENT, SWALE. "On the Comparative Histology of the Suprarenal Glands," Internal. 



Monatschr.f. Anat. und Physiologic, Band XV, 1898. 



