BIBLIOGRAPHY. 



ALZHEIMER, A., 1910. Beitriigc zur Kenntnis der patho- 

 logischen Neuroglia und ihrer Beziehungen zu 

 den Abbauvorgiingcn im Nervengewebe. Histol. 

 u. Histopath. Arbeit liber Grosshirnrinde (Nissl- 

 Alzheimer) Jena, vol. 3, p. 401-562. 



ESSICK, C. R., 1915. Transitory cavities in the corpus 

 striatum of the human embryo. Contributions to 

 Embryology, Carnegie Inst. Wash. Pub. 222, 

 p. 95-108. 



EVANS, H. M., 1915. The macrophages of mammals. 

 Amer. Jour. Physiology, vol. 37, p. 243. 



GOLDMANN, E. E., 1912. Neue Untersuchungen iiber die 

 aiissere u. innere Sekretion des gesunden u. 

 kranken Organismus. Tubingen. 



GOLDMANN, E. E., 1913. Vitalforbung am Zentral- 

 nervensystem. Beitrag zur Physiopathologie des 

 Plexus Chorioideus und dcr Hirnhaute. Berlin. 



KEY and RETZIUS, 1875. Studien in der Anatomic des 

 Nervensystem und des Bindgewebes. Stockholm. 

 Erste Halfte. 



MAXIMOW, A., 1909. Archiv. fur niikr. Anat. vol. 73, 

 p. 444-561. 



METSCHNIKOFF, E., 1892. Lecons sur la pathologic 

 compared de 1'inflammation. Paris. 



MERTZBACHEU, L., 1909. Ubcr die Morphologic und Bio- 

 logic der Abraumzellen im Zentralnerven-system. 

 Histol. u. Histopathol. Arb. (ib Gross-hirnrinde 

 (Nissl-Alzheimer), Bd. 3 l , Jena, p. 1-142. 



QUINCKE, H., 1872. Zur Physiologic der Cerebrospinal 

 flussigkeit. Arch. f. Anat. u. Physiol. (Du 

 Bois Reymond), p. 153-177. 



SCHOTT, E., 1909. Morphologische u. experimentelle 

 Untersuchungen iiber Bedeutung u. Herkunft 

 der Zellen der Serosen Hohlen u. der sogenannten 

 Makrophagen. Arch. f. mikr. Anat., Bd. 74, 

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WEED, L. H., 1914. Studies on cerebro-spinal fluid. 

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 spinal fluid. Anat. Rec., vol. 12, p. 461-496. 



DESCRIPTION OF FIGURES. 



FIG. 1. Normal flattened appearance of cells covering 

 the arachnoidal trabeculae. Hematoxylin and eosin. 

 X 900. 



FIG. 2. Three stages in transformation of arachnoidal 

 cells into macrophages occurring after injection of 

 erythrocytes: (a) Primary increase in protoplasm 

 about the nucleus, (b) Beginning formation of a 

 mcshwork. (c) Swelling up preparatory to budding 

 off. Hematoxylin and eosin. X 900. 



FIG. 3. Initial swelling of protoplasm as shown in prep- 

 arations stained with aqueous toluidin blue. X 900. 



FIG. 4. Phagocytosis of fragmented erythrocytes and 

 blood pigment by cells covering arachnoidal trabec- 

 ula:. Aqueous toluidin blue. X 900. 



FIG. 5. Division of arachnoidal cell on trabecula. Tolui- 

 din blue. X 900. 



FIGS. 6, 7, 8. Phagocytic macrophages from subarach. 

 noid space. Stained with aqueous toluidin blue 

 X 900. 



FIG. 9. Macrophage from subarachnoid space. Stained 

 with hematoxylin and eosin. X 900. 



FIG. 10. Amoeboid macrophage from subdural space. 

 Stained with hematoxylin and eosin. X 900. 



FIG. 11. Arachnoid membrane showing phagocytosis of 

 blood-pigment (lower portion of illustration). 

 Reproduction of new elements is shown by mitosis. 

 In the upper left corner appears a portion of an 

 arachnoidal cell condensation. Stained with hema- 

 toxylin and eosin. X 700. 



FIG. 12. Photomicrograph of arachnoid membrane show- 

 ing clusters of macrophages after subarachnoid 

 injection of lakcd blood. X 280. 



388 



