Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . lk — 5 drops of percent hydrochloric acid. Now toeachof the tubes c , d ,and e; adds drops of rennin solution. Place the wholeseries of five tubes at 40^C. and after 10-15 minutes note what is occurring in thedifferent tubes. Give a reason for each partictilar result. How do ammoniumoxalate and sodium carbonate prevent coagulation? ^ Any good commercial rennin or rennet preparation may be used in preparing thissolution. CHAPTER VIII GASTRIC ANAL
Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . lk — 5 drops of percent hydrochloric acid. Now toeachof the tubes c , d ,and e; adds drops of rennin solution. Place the wholeseries of five tubes at 40^C. and after 10-15 minutes note what is occurring in thedifferent tubes. Give a reason for each partictilar result. How do ammoniumoxalate and sodium carbonate prevent coagulation? ^ Any good commercial rennin or rennet preparation may be used in preparing thissolution. CHAPTER VIII GASTRIC ANALYSIS The method of gastric analysis which has been in vogue clinicallyfor years (see page 174) entails the feeding of a standard test meal,the removal of the complete stomach contents at the end of a one-hour period, and the analysis of the material so removed. That thismethod is inaccurate has been repeatedly demonstrated in the authorslaboratory^ and elsewhere.^ Furthermore, owing to the bulk of theold form of stomach tube and the discomfort occasioned by its use, itis impossible to follow the whole cycle of digestion and estimate, step. Time Ihr. 2hr. Fig. 41.—Normal and Pathological Curves after an Ewald Meal. I. normal curve; 2 delayed digestion with late hyperacidity; 3, larval hyperacidity;4, tardive hyperacidity; 5, marked continued secretion from obstruction. by step, the exact changes which take place in the stomach after theintroduction of definite food mixtures into that organ. Realizing the inadequacy of the procedure entailed in the oldmethod of gastric analysis, a new procedure has been developed by E. Rehfuss in the authors laboratory. This so-called Frac-tional Method entails the analysis of samples of material withdrawnfrom the stomach (by syringe) at short intervals for a period of twohours or more (until stomach is empty) after the ingestion of the testmeal. By this means the observer is able to follow the entire cycle of Rehfuss: Jour. Am. Med
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