411 



The point found for the disappearance of cilia in the lung of man 

 and cat agrees with none of the results referred to. The point determined 

 upon in the lung of the cat was in bronchi between 0,6—0,5 mm in 

 diameter, and in the lung of man in bronchi between 0,5—0,4 mm in 

 diameter, both of which are higher than the other results. Kölliker 

 gives 0,4 — 0,3 mm as the point of disappearance, Fkankenhauser be- 

 tween 0,3 — 0,2 mm, while Schulze says they disappear at the point of 

 transition of the bronchi into the alveolar passages. 



The greatest difference is found in the results given for the glands. 

 All except Frankenhauser, Stöhr and Remak give bronchi of 1 mm 

 in diameter as the point of disappearance. The point of disappearance 

 found in both the lung of man and of the cat agrees most closely 

 with that given by Frankenhauser, who says they disappear in 

 bronchi 0,3 mm in diameter, the point found in the lung of the cat was 

 between 0,4—0,3 mm in diameter and in the lung of man in bronchi 

 0,3 mm in diameter. Stöhr gives bronchi 0,5 mm in diameter as the 

 point of disappearance, while Remak says, they are found in the finest 

 ramifications of the bronchi. 



The results obtained in the study of the lung of the pig differs 

 somewhat from the other results obtained. Cartilage was found to 

 disappear in bronchi between 0,6 — 0,5 mm in diameter being nearest the 

 point given by Frankenhauser who found it to disappear in bronchi 

 0,4 mm in diameter. Goblet cells were found to disappear in bronchi 

 0,6 mm in diameter, agreeing fairly well with the results obtained in 

 the lung of man and cat and with points given by Kölliker and 

 Frankenhauser. Cilia were found to disappear in bronchi 0,3 mm in 

 diameter, agreeing very closely with results obtained by Kölliker 

 and Frankenhauser, but the bronchi are finer than those in which 

 the goblet cells were found to disappear in the lung of man and cat. 

 Glands were found to disappear in bronchi between 0,7 — 0,6 mm in 

 diameter, being nearest the point given by Stöhr but diifering con- 

 siderable from the results obtained in study of the lungs of man and 

 the cat. 



Bibliography. 



1) Kölliker, Zur Kenntnis des Baues der Lunge des Menschen, Würz- 

 burg 1881. 



2) Fkankenhauser, Untersuchungen über den Bau der Tracheobronchial- 

 schleirahaut, St. Petersburg 1879. 



3) Schulze, Strickers Handbuch der Lehre von den Geweben, Leipzig 

 1871. 



4) Henle, Anatomie des Menschen, Braunschweig 1873. 



