THE PINEAL BODY OF THE SHEEP 269 



8. There is no clear histologic evidence indicative of a glandular 

 function. 



9. If the pineal body in the sheep subserves an important physi- 

 ologic function, this is probably active only during the first eight 

 months of post-natal life. 



10. The sole cytoplasmic granules are melanic and probably 

 have only ancestral significance. The cysts are similarly inter- 

 preted. 



11. The neuroglia fibers appear to have their origin in the thick- 

 ened and fused spongioplasmic fibers. 



LITERATURE CITED 



CiONiNi, A. 1888 La ghiandola pineale e il terzo occhio dei vertebrati. Ri\'. 

 sperim, di freniatria, vol. 14. Neurol. Zentralblatt 1887, no. 20. 



DiMiTROVA, Z. 1901 Recherches sur la structure de la glande pineali chez quel- 

 ques mammiferes. Le Nevraxe, tome 2: no. 3. 



ExNER AND BoESE 1910 Uber Exporimentelle Extirpation des Glandula Pine- 

 alis. Deut. Zeit. f. Chir., October. 



Eyster, J. A. E. (with Jordan, H. E.) 1911 The effects of intravenous injec- 

 tions of extracts of the pineal body. Proc. Am. Phys. Soc, Am. 

 Journ. Phys., February. 



Flesch, Max 1887 tJber die Deutung der Zirbel bei den Saugetieren. Anat. 

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Hagemann 1871 tJber den Bau des Conarium (Dissert., Gottingen). Arch. f. 

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Hardesty, I. 1902 The neuroglia of the spinal cord of the elephant, with some 

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1904 On the develojiment an<l nature of the neuroglia. Am. Jour. 

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Huber, G. Carl 1901 Studies on the neuroglia. Am. Jour. Anat., vol. 1. 

 1903 Studies on neuroglia tissue. Vaughan Festschrift. 



Illing, p. 1910 Vergleichend Anatomische und Histologische Untersuchungen 

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