TERMINALS OF HUMAN BRONCHIOLE 201 
In 1907 J. Miiller investigated the lungs of most of the domes- 
tic animals, using metal corrosions as well as sections. His 
conclusions regarding the occurrence of atria he states as follows: 
Hinsichtlich des neuen Luftraumes, des Atriums, war es mir nun 
weder an den Korrosionspraparaten noch an den Schnitten bei irgend 
einem unserer Haussiiugetiere méglich, ihn alseinen Luftraum sui gene- 
ris bestitigen. Wenn auch da und dort einmal ein Alveolengang vor 
seiner Auflésung in die Infundibula eine buchtige Erweiterung zeigte, 
welche etwa dem ‘Atrium’ Justesens entsprechen kénnte, so habe ich 
doch niemals zwischen jedem Infundibulum und dem Alveolargang, 
noch auch zwischen mehreren Infundibeln und einem solchen einen oder 
mehrere kugelige Hohlriume eingeschaltet gesehen, welche fiir das kon- 
stante Vorkommen der Millerschen Atrien sprechen kénnten. 
Miiller found alveolar pores in various animals, but not in 
young animals. He thinks these are pathological. 
Just as my first model was completed, I received the number 
of The American Journal of Anatomy that contained two arti- 
cles by the Japanese investigator Ogawa, who by an interesting 
coincidence had been working in the University of Kyoto at 
exactly the same problem as myself and by similar methods, 
but had evidently begun the construction of his model some 
months before I started with mine. Ogawa worked with human 
material, and constructed both a negative and a positive model 
of the terminal branchings of the lung, the former being at a 
magnification of 100 diameters and measuring 8 x 12 x 8 cm., 
while the latter was enlarged 80 diameters and measured 11.3 
x 24x 20cm. Like Schulze and Miller, he reaches the con- 
clusion that ‘‘ Miller’s atrium is an unnecessary term, at least for 
the human lung.” In his second paper he states that ‘‘alveolar 
pores are normally found in many mammals, and only seldom 
cannot be seen.’’ Further reference to Ogawa’s work will be 
made when his results are compared with my own. 
MATERIAL 
The material used was exclusively human and consisted of 
portions of the lungs of two individuals obtained at autopsies 
performed soon after death. One of the individuals was a woman 
of thirty years who had died of heart disease (mitral stenosis), 
