CONTENTS. XIX 



III. 



PAGE 



On the Diffusjbility of Albumoses and Peptones 489 



(Supplementary to pages 135 and 141.) 



IV. 



Kiihne's New Method of separating Albumoses from Peptones, and for the 



Preparation of the latter 490 



(Supplementary to pages 136 and 137.) 



V. 



Notes and Additions on the Nature of the Acids of the Gastric Juice and Gastric 



Contents 495 



(Supplementary to pages 9295 and 179.) 



1. On the Colour Eeactions which may be employed in the investigation of the 



Acids of the Gastric Juice and Gastric Contents 495 



2. On the systematic use of certain Colour Reactions in determining the 

 presence of Mineral and Organic Acids in the Contents of the Stomach, 

 and on the Quantitative Estimation of the 'Total Acidity,' and of the 

 ' Acidity ' due to Free Acids (Martius and Liittke) 497 



1. Determination of Reaction. Is Hydrochloric Acid present ? . . 497 



2. Quantitative Determination of Total Acidity 498 



3. Quantitative Determination of Free Acids 498 



3. Additional Methods of determining the Acids and especially the Amount 



of HC1 in the Gastric Juice 499 



(Supplementary to pages 95100 and 178182.) 



1. The Method of Cahn and v. Mering for the determination of the 

 total Hydrochloric Acid, the Volatile Acids, and the Lactic Acid of 



the Contents of the Stomach ... .... 499 



2. The Method of Sjoqvist modified by v. Jaksch of determining the 



total HC1 in the Gastric Contents 500 



3. The Method of Hayem and Winter for determining the free and 

 combined HC1 of the Gastric Contents 501 



4. Luttke's Method of determining the total quantity of Hydrochloric 



Acid in the Gastric Contents 502 



(A) The Principles on which the Method is based . . . 502 



(B) The Standard Solutions employed in Luttke's process . 503 



(C) The Actual Process of Analysis 504 



VI. 



On Methyl-Mercaptan as a product of the putrefaction of Albuminous Sub- 

 stances and as a Gaseous Constituent of the Large Intestine . . . 506 



(Supplementary to pages 420, 428, 466.) 

 INDEX . 507 



