CONTENTS. XIX 



XXVII. Methods for the detection and determination of food preservatives Con. p a go. 



11. Sucrol or dulcin 189 



(a) Morpurgo's method 189 



(b) Jorissen's method 189 



XXVIII. Methods for the detection and determination of coloring matter 190 



1. General discussion 190 



2. Detection of artificial colors by dyeing wool 190 



(a) Method of Sostegni and Carpentieri 190 



(b) Arata's method 191 



3. Detection of coal-tar colors by extraction with solvents 192 



4. Detection of acid magenta (Girard's method) 193 



5. Test for Martius yellow or naphthalene yellow 193 



6. Rota's method of identification of organic coloring matter 193 



7. Determination of vegetable colors 199 



8. Detection of turmeric 199 



9. Detection of caramel 199 



(a) Amthor test 199 



(b) Crampton and Simons' fuller's earth method 199 



10. Detection of cochineal 200 



XXIX. Methods for the analysis of drugs 201 



1. Assay of opium 201 



(a) Reagents 201 



(b) Determination 201 



XXX. Reference tables t 203 



Table I. Specific gravity and percentage of alcohol (according to 



Squibb) 203 



II. Percentage of alcohol (recalculated from the determina- 

 tions of Gilpin, Drinkwater, and Squibb) 203 



III. Extract in beer wort (according to Schultz and Ostermann) 209 



IV. Extract in beer wort (according to H. Ellion) 214 



V. Extract in wine (according to Windisch) 218 



VI. Relation of Brix, specific gravity, and Baume 221 



VII. Correction for the readings of Balling's saccharometer, on 



account of temperature 224 



VIII. Per cent of fat and solids not fat in milk (according to Bab- 

 cock) 225 



IX. Determination of pentoses and pentosans from phloro- 



glucid (Krober) 226 



X. International atomic weights, 1907 230 



XI. Conversion of nitrogen to protein 231 



Appendix [not included in index] 233 



I. Methods for the analysis of fertilizers 233 



Thomas or basic slag 233 



II. Methods for the analysis of soils 234 



Total organic carbon 234 



Total phosphorus (sodium peroxid fusion method) 234 



III. Inorganic plant constituents 236 



Combustion method 1 236 



Preparation of ash without the use of calcium acetate 238 



IV. Methods for the analysis of insecticides and fungicides 239 



Lead arsenate (Haywood) 239 



