_Treatment_ is surgical and consists in the removal of the tumors by incision and ecraseur or otherwise. Thoracic œsophagean tumors are usually inoperable. IMPACTION OF THE CROP. INGLUVIAL INDIGESTION. Gallinaceæ and Palmipeds. Causes; Overfeeding after privation; fermentation; lack of water; green food in geese and chickens; food containing paralyzing element. Symptoms; dull; motionless; erect plumes; drooping wings and head; gapes; ejects liquid from bill; firm cervical swelling. Treatment; manipulation; incision; surgical precautions. Convalescent feeding. The cervical dilatation of the œsophagus known as the crop is well developed in all granivorous birds, (Gallinaceæ, etc.;) and like the macerating cavities of the ox (first two stomachs) is subject to overdistension and paralysis. In the palmipeds (ducks, geese) there is no distinct crop but in its place the cervical portion of the gullet has a fusiform dilatation, and under given conditions this may be also the seat of impaction. _Causes._ The impaction may result from overfeeding when the bird has been starved, or when it suddenly gains access to food of a specially appetizing kind and to which it has been unaccustomed. The crop like every other hollow viscus is rendered paretic by overdistension. Then the food undergoes fermentation still further distending the cavity, affecting the brain by reflex action, and paralyzing the vagus and its peripheral branches in the lungs, heart, stomach, liver, intestines, etc. When the food is dry as in the case of beans, peas, bran, farinas, it may be a simple firm impaction which the muscular walls of the crop are unable to break up or move onward. When green food is taken there is often superadded the additional evil of active fermentation from the great number and activity of the bacterial ferments contained in it and the soft aqueous fermentescible nature of the food (See _tympany in ruminants_). Dupont states that young geese led out to fresh spring grass may lose two-thirds of their number in a few hours from such overloading and that some species of _Carex_ and cynodon dactylon are particularly injurious. Chickens also gorge the crop with clover, etc. In all such cases, plants that contain a paralyzing principle like lolium temulentum, ripening lolium perenne, chick vetch, etc., are to be specially dreaded. (See Trichosoma Contortum).