280 METHODS OF ANALYSIS [Chap. 



the sample by comparison with the standard comparison tubes. If the solution is 

 too dark for comparison with the standards, dilute with water and correct the 

 result accordingly. 



29 PRESERVATIVES.— TENTATIVE. 

 Proceed as directed under X. 



30 METALS.-TENTATIVE. 

 Proceed as directed under XII. 



31 COLORING MATTERS.-TENTATIVE. 

 Proceed as directed under XI. 



MEAT EXTRACTS AND SIMILAR PRODUCTS. 



32 PREPARATION OF SAMPLE.-TENTATIVE. 



Remove liquid and semi-liquid meat extracts and similar preparations from the 

 container and mix thoroughly before sampling. A little heating expedites the 

 mixing of pasty extracts. In many liquid preparations a sediment forms which 

 should be carefully removed from the bottom of the container and included in the 

 sample. If the sample is in the form of cubes, grind 10-12 of the cubes in a mortar. 



33 MOISTURE.-TENTATIVE. 



Proceed ae directed under VIII, 2, employing about 2 grams of powdered prepa- 

 rations, about 3 grams of pasty preparations, or 5-10 grams of liquid extracts, 

 according to the solid content. Dry the powdered preparations directly without 

 admixture. Dissolve the pasty preparations in water and dry with sufficient ignited 

 sand, asbestos or pmnice stone to absorb the solution. When glycerol is present, 

 proceed as directed under VIII, 3. 



34 ASH.-OFFICIAL. 



Proceed as directed under VIII, 4. Add sufficient water tt) pasty preparations 

 to effect solution and evaporate to dryness in order that the solids may be distrib- 

 uted evenly over the bottom of the dish. 



35 TOTAL PHOSPHORUS.— TENTATIVE. 



Proceed as directed under 5. 



30 CHLORIN.— TENTATIVE. 



Dissolve about 1 gram of the sample, prepared as directed in 32, in 20 cc. of 5% 

 sodium carbonate solution and proceed as directed under III, 18. 



37 FAT.— TENTATIVE. 



Transfer the residue from the determination of moisture to a continuous extrac- 

 tion apparatus and proceed as directed under VIII, 10. 



38 TOTAL NITROGEN.— OFFICIAL. 



Proceed as directed under I, 18, 21 or 23. 



