CONTENTS. XIU 



CHAPTER X. 



PROTEIDS. AMIDES. AMMONIA. NITEATES, &C. 



Literature. Practical classification of nitrogenous plastic, sub- 

 stances. QuaUtative examination for proteids insoluble in water, soluble 

 in dilute alkali — for proteids soluble in water — for peptones and albu- 

 moses — for amides — for ammonia, nitrates, nitrites. Estimation of 

 proteids — of peptones and albumoses. Estimation of amides. Estima- 

 tion of ammonia, nitrates and nitrites. Experiments on nitrogenous 

 metabolism. Qualitative examination of Onobrychis sativa for proteids 

 Ac. Comparison of amounts of proteids, peptones, amides in seeds of 

 Onobrychis and in shoots of the same grown under various conditions. 

 Comparison of amounts of ammonia, nitrates, nitrites in shoots of 

 Onobrychis from plants variously treated . . pp. 231 — 242. 



CHAPTER XI. 



OILS AND FATS. GLTCBRIN. 



Literature. Extraction of oils and fats. Qualitative examination of 

 benzene extract. Beactions of glycerin. Quantitative examination. 

 Determination of total oils and fats — of free fatty -acids — of glycerin. 

 Experiments. Determination of oils and fats in seeds of Lepidimn — 

 in seedlings of Lepidium, young and old . . . pp. 243 — 247. 



CHAPTER XII. 



TANNINS AND GLUCOSIDES. 



Literature. Extraction of tannins and gluoosides. Many different 

 bodies included under heading tannin and glucoside. Qualitative tests 

 for tannins. Qualitative tests for phlorogluein. Eemoval of tannins 

 before examining for sugars. Determination of whether a. tannin is a 

 glucoside or not. Glucosides. Identification of salioin. Examination 

 for certain sugars. Experiments. Testing extract of wUlow-bark for 

 tannin, saiicin, sugars. Estimation of certain sugars in young and old 

 fruits ol Musa sapientum ...... pp.248 — 257. 



