CHAPTER VI. 

 DIGESTION AND ABSORPTION. 



DIGESTION. 



As stated in the Introduction, it is taken for granted that by th< 

 time a medical school has found the conditions propitious for thi 

 establishment of a laboratory of experimental physiology, the whoL 

 province of chemical physiology will have been occupied by th< 

 department of chemistry as a legitimate growth of that department 



The American laboratory of experimental physiology will presen 

 almost exclusively the physical problems of physiology. But evei 

 where such are the conditions, it may seem advisable to introduce 

 into a course of lectures or recitations on the physiology of digestioi 

 a series of demonstrations. 



The following exercises in the chemistry of digestion and th 



Ehysics of absorption may be given either as demonstrations or a 

 iboratory exercises. 



This chapter is not intended as a substitute for any of the exceflen 

 treatises now used in medical schools, but rather as a supplemen 

 to them. 



It will be taken for granted that the student has had at least on 

 year of chemistry before he enters upon this course. 



To give the course which is outlined, one will need the followinj 

 apparatus and reagents: 



1. Appliances, (a) Glassware Utensils, etc. 10 evaporating dishes 

 assorted sizes; 10 filters, assorted sizes, 5 cm. to 20 cm.; 100 test 

 tubes, 15 cm.; 10 beakers, 30 c.c.; 10 beakers, assorted, 50 c.c. to 2 1. 

 10 50-c.c. graduated cylinders; 4 graduated cylinders, 100 c.c., 20< 

 c.c., 500 c.c., 1000 c.c.; 3 Wedgewood mortars, 2f, 4, and 7 inche 

 in diameter; filter papers; labels; pig-bladders; thread; rubber tubing 

 and glass stirring rods. 



(b) Apparatus. Bunsen burners, with rubber tubing; filter stand 

 2 supports, with rings and gauze; dialyzers; 1 incubator; dryini 

 oven; meat hasher; desiccator; water-baths; platinum dishes, 1, 

 c.c. to 100 c.c. 



2. Reagents. Diluted iodine, Fehling's solution, sodium hydrat 

 and potassium hydrate, copper sulphate, distilled water, 6 thistl 

 tubes, neutral litmus, concentrated nitric acid, strong ammonia 

 acetic acid, osmic acid (1 per cent.), pure standard pepsin, muriati 

 acid (c. p., sp. gr. 1.16 = 31.9 per cent. abs % HCl), absolute alcohol 



