. A text-book of physiology : for medical students and physicians . fact is of importance in con-nection with the salivary digestionof the starchy foods. Obviously,salivary digestion may proceed fora time in the fundic end withoutbeing affected by the acid of thestomach. Grutzner fed rats withfood of different colors and foundthat the successive portions were rtonS«»r2?JrSS&diitte?1S arranged in definite strata. Thesho™ the stratification of food given f00d first taken lay next to the at different times.—(Grutzner.) The ^ food was given in three portions and walls of the Stomach, whil
. A text-book of physiology : for medical students and physicians . fact is of importance in con-nection with the salivary digestionof the starchy foods. Obviously,salivary digestion may proceed fora time in the fundic end withoutbeing affected by the acid of thestomach. Grutzner fed rats withfood of different colors and foundthat the successive portions were rtonS«»r2?JrSS&diitte?1S arranged in definite strata. Thesho™ the stratification of food given f00d first taken lay next to the at different times.—(Grutzner.) The ^ food was given in three portions and walls of the Stomach, while the colored differently: first, black; sec- -,. .. <? ond, white (indicated by vertical succeeding portions were arranged marking); third, red (indicated by 1 1 • ,1 • , transverse marking). regularly m the interior in a con- centric fashion, as shown in thefigure. Such an arrangement of the food is more readily understoodwhen one recalls that the stomach has never any empty space* Grutzner, Archiv f. die gesammte Physiologie, 106, 463, MOVEMENTS OF THE ALIMENTARY CANAL. 723 within; its cavity is only as large as its contents, so that thefirst portion of food eaten entirely fills it and successive por-tions find the wall layer occupied and are therefore receivedinto the interior. The ingestion of much liquid must interferesomewhat with this stratification. Cannon* has reported someinteresting experiments upon the relative duration of gastricdigestion for carbohydrates, proteins, and fats when fed separatelyand combined. The foods were mixed with subnitrate of bismuthand their position in the stomach and passage into the intestinewere watched by means of the Roentgen rays. It was found thatcarbohydrate food begins to pass out from the stomach soon afteringestion, and requires, only about one-half as much time as the pro-teins for complete gastric digestion. Fats remain long in thestomach when taken alone, and when combined with the otherfoodstuffs markedly
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