376 E. A. BAUMGARTNER 



The first outgrowth is knob-hke. Soon a stalk develops 

 givmg rise to lateral branches with enlarged end pieces. In a 

 19 cm. fetus, these enlargements present bulgings of the surface 

 and beginnings of alveoli. These retain various connections 

 with the ducts and with each other, so that in the newborn the 

 serous gland is of the alveolar type with some anastomoses 

 between the alveoli. In the adult (twenty-two years) some of 

 the glands are of the tubular type with, some anastomoses 

 between end-pieces of the same and separate ducts. 



In the newborn, many knob-like outgrowths appear on the 

 large ducts; in older specimens the number is less. These out- 

 growths are probably the anlagen of future glands, or at least 

 potential anlagen. 



Cystic dilatations of the serous ducts may occur. 

 ■ Mucous end-pieces occasionally open into the ducts of serous 

 glands of the vallate papillae. 



The serous glands of the vallate papillae of man belong there- 

 fore to the branching tubulo-alveolar and not to the branched 

 tubular type as stated by Maziarski. 



BIBLIOGRAPHY 



Von Ebner, V. 1873 Die acinosen Drlisen der Zunge und ihre Beziehungen zu 



den Geschmacksorganen. Graz. 

 Erdheim, J. 1904 I. Ueber Schilddriisenaplasie. II. Geschwiilste des ductus 



Thyreoglossus. III. Ueber einige menschliche Kiemenderivate. 



Beitr. z. path. Anat. und allg. Path., Bd. 35. 

 Gmelin, a. 1892 Zur Morphologie der Papilla vallata und foliata. Arch. 



mikr. Anat., Bd. 40. 

 Graberg, J. 1898 Beitrage zur Genese der Geschmackknospen des Menschen. 



Morph. Arb., Bd. 8. 

 Maziarski, S. 1901 Ueber den Bau und die Einteilung der Drlisen. Anat. 



Hefte, Bd. 18. 

 McMuRRiCH, J. p. 1912 In Keibel and Mall, Manual of Human Embryology. 



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 Oppel, a. 1899 Zur Topographic der Zungendriisen des Menschen und einiger 



Saligethiere. Festsch. z. 70. Geburtstag von C. v. Kuptfer. 

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Inaug. Diss. Dorpat. 

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Anhjinge des Ductus Thyreo-glossus. Fesctsch. f. B. Schmitt. Jena. 

 ScHWALBE, G. 1868 Ueber die Geschmacksorgane der Siiugethiere und des 



Menschen. Arch. mikr. Anat., Bd. 4. 



