THE ALIMENTARY TRACT 169 
mouth to the cardia. There has been no important data 
upon ingluveal indigestion or esophageal obstruction. 
Birds especially, and occasionally mammals, gorge them- 
selves or take too large a bolus, but it seems as if this is 
only fatal where some distinct important pathology is 
present which has reduced their resistance. In the lower 
esophagus one has to deal with worms in connection with 
the proventricle in birds, but no mammals seem to have 
suffered with temporary or permanent strictures. *' Crop- 
binding" has occurred in the following orders: Psittaci, 
Galli; and overfilling of the esophageal dilatation was 
seen in Accipitres and Herodiones ; Columbidas with their 
double crop were not affected by this abnormal collection 
of food in the esophagus. 
Dilatations of Esophagus. 
The mammals have shown three dilatations of the 
esophagus interesting enough to detail briefly : 
Mongoose Lemur {Lemur mongoz) 6 . Sacculo-fusiform dilatation 
of esophagus, probably congenital, with adjacent fibrosis of lung. In 
poor condition for several years but recovered satisfactorily from a 
bad cut inflicted by cage-mates. At autopsy the general condition is 
poor, hair missing in spots, all skin dry and atrophic with patches of 
keratotic dermatitis. All tissues anemic, muscles lusterless. Right 
lung collapsed, brown and pink, spotted with anthracosis. Left lung 
pushed forward and to left by a mass in the posterior mediastinum. 
Lower lobe in its posterior portion is adherent to esophageal mass. 
Lower half of this lobe beginning where bronchus ends and extending 
over anterior-posterior surfaces shows marked fibrotic processes and 
at one point in tissue between end of bronchus and adherent esophagus 
there is no lung tissue remaining. No recent consolidations. Bronchial 
lymph nodes, small, Ann homogeneous pale brown with specks of anthra- 
cosis. Heart contracted, normal in size, firm red-brown. Aorta is 
firmly adherent to esophageal mass where bronchus crosses it. The 
lower half of the esophageal from the hilum of the lung to the cardisi 
is the seat of a dilatation, fusiform for the most part, but with a saccular 
portion anteriorly. This latter presses the left bronchus upward and 
heart forward. The wall of the tube is slightly irregularly thickened 
but there is no cicatrix and mucosa shows slight hypertrophic condi- 
tion. A large mass of food occupies the dOatation. Stomach is empty 
save for gas. Mucosa is soft, smooth, pale pink. Duodenum shows 
12 
