AUTHOR'S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, MAY 10 
THE FINER RAMIFICATIONS OF THE HUMAN LUNG 
CHIKANOSUKE OGAWA 
Department of Anatomy, Kyoto University, Japan 
EIGHT FIGURES 
Anatomical knowledge of the mammalian lung, especially of 
the human type, has recently much improved. Yet there appear 
many problems which ought to be solved in the future. Here 
I will deseribe the results of my study of the finer ramifications 
of the human lung. 
I am greatly indebted to Prof. B. Suzuki for the use of many 
microscopical preparations and wish also to express my appre- 
ciation of his many helpful suggestions. 
MATERIAL AND METHODS 
The following four methods have been used in the investigation 
of the finer ramifications of the human lung: 1) Drying method; 
2) corrosion method; 3) graphic method; 4) reconstruction 
method. 
1. The drying method is simple to carry out, but it is insuffi- 
cient for the investigation of finer morphological conditions. 
2. The corrosion method is also widely used in this sort of 
study. Toldt, Miiller, Sussdorf, and others consider it adequate, 
nevertheless Justesen holds an entirely opposite idea. I in- 
spected several corrosive preparations and found much incon- 
venience with them. The alveolar ducts in corrosion prepa- 
rations inevitably become misshapen by the weight of the injected 
metal and by the air or mucus which may be left in the air 
passages. Hence such a method is inadequate for detailed study. 
3. The graphic method has been described and recommended 
by Justesen, but Hammar opposes him. This method has also 
disadvantges for fine study. 
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