146 GEO. S. HUNTINGTON 
Narath (33, p. 333), sums up the morphological characters 
which the eparterial and dorsal bronchi have in common as 
follows: 
1. Both exhibit a great variety in their point of origin from 
the stembronchus, and a marked capacity for ‘wandering’ 
(‘Wanderungsfihigkeit’). 
2. Both arise at a higher level from the stembronchus than the 
corresponding ventral bronchi. 
3. Both have the faculty of defaulting altogether in certain 
cases. 
4. Both can arrange themselves in a well ordered serial row. 
5. Both agree in their relation to the pulmonary artery. 
6. Both supply only dorsal pulmonary segments. 
7. They may be double or multiple. 
8. Accessory bronchi may develop alongside of them from the 
stembronchus. 
9. Occasionally they agree in their form and type of branching. 
10. They have the same arterial supply. 
11. In the Monotremes their veins are correspondingly 
arranged. 
On the basis of these eleven common characters Narath de- 
clares unequivocally that Aeby’s eparterial and his apical bron- 
chus is nothing else than the first dorsal derivative of the stem- 
bronchus shifted by ‘migration’ to a new site. The fallacy of 
this contention is evident. ‘The characters 1, 3, 4, 7, 8, 9 listed 
above again only speak for variability in origin and accentuate 
that fact that the dorsal lung segments can receive their bronchial 
supply from any accessible point on the stembronchus. What- 
ever regularity of origin exists for the dorsal bronchi in certain 
corrosion preparations, depends, upon the limitations of this 
accessible range. No. 2 does not hold good in all cases for the 
dorsal bronchi below the eparterial even if the designation D? is 
substituted for Aeby’s D'. No. 6 is disproved for the eparterial 
' bronchial distribution by innumerable instances. No. 10 only 
pertains in the sense that all portions of the lung receive branches 
from the pulmonary artery. 
