or 
99 
growing bronchi. Within these connective tissue lobules, the frame- 
work differentiates as the embryo grows, forming simultaneously base- 
ment membranes for the young bronchial buds. At the same time, 
the interlobular fibres and those below the pleura, unite to form trabe- 
culae. As the Lobuli respiratorii, towards the end of foetal life, begin 
to impinge on each other, the interalveolar framework and the two 
adjacent basement membranes are pressed together into a single wall 
or septum in which the blood vessels run. These lobules persist until 
adult life, although they may become compound by the rupture of the 
interlobular septa and the subsequent confluence of several adjacent 
lobules. This process ordinarily takes place at the base, leaving the 
periphery of the compound lobule separated by partial septa. 
18. The lymphatics appear at the root of the lung in an embryo 
4—5 cm in length. Accompanying the bronchi and pulmonary vessels, 
they gradually grow in for some distance until the smaller air pas- 
Sages are reached, when they leave these structures and grow towards 
the pleura in the interspaces between the smaller bronchi, in what 
represent the primitive interlobular spaces. In this way, they aid in 
the differentiation of the connective tissue lobules. The reason for this 
course is not entirely clear, but it may be due to the increasing den- 
sity of the framework about the bronchi, which forces the later ap- 
pearing lymphatics into the interlobular spaces as a locus minoris re- 
sistentiae. Upon reaching the pleura, they turn and form a plexus 
in the subpleural connective tissue. Here and there, they may be seen 
penetrating the lobules, but cannot be followed for any distance in 
them. At 23 cm, the first evidence of the submucous plexus is seen 
in the stem bronchi. 
Nachdruck verboten. 
Nochmals zur Morphologie der Augenlider. 
Von Dr. H. Esseuıns, a.o. Professor u. Prosektor am anat. Institut Jena. 
Meine beiden Mitteilungen iiber die Morphologie der Augenlider 
[a) Jenaische Zeitschr. f. Naturw., Bd. 39, 1904; b) Verhandl. Anat. 
Gesellsch., X VIII. Versamml. Jena 1904] haben zu einigen Erörterungen 
Anlaß gegeben, die mir zeigen, daß ich stellenweise mißverstanden bin. 
Es handelt sich um die Abhandlung von OTTO ZIETZSCHMANN in 
v. GRAEFES Archiv, Bd. 53, 1904, das Referat von KArLLıuUs in MERKEL- 
Bonnets Ergebnissen für 1904, erschienen 1905, und das Referat von 
Hans VIRCHOw in SCHWALBES Jahresberichten für 1904, erschienen 
3* 
