Josepli Marshall Flint 295 



smaller forms, according to Maziarski, the duct for the whole group of 

 alveoli. 



If one were to take a piece of the corrosion, as for example, Fig. 3, 

 and clothe different portions with the epithelium which they normally 

 possess, a picture would be obtained in this way almost identical with 

 that given by Maziarski, except that owing to the regular distension of 

 the system with the injection mass the form in this case would be some- 

 what more regular than that observed in Maziarski's reconstruction. 

 The latter did not recognize the ampullse within the alveoli as they 

 were collapsed by the fixation of the tissue, and therefore, are not ren- 

 dered patent except, perhaps, in exceptional cases. 



In conclusion, I wish to express my great indebtedness to Dr. Eevell, 

 of the Department of Anatomy of the University of Chicago, for the 

 drawings of the corrosions. 



