XXVII. TEA. 



1 DUST, STEMS AND FOREIGN LEAVES.— TENTATIVE. 



Place 1 gram of the tea in a 300 cc. casserole, add 200 cc. of boiling water and 

 allow to stand 15 minutes. This treatment will cause the leaves to unroll, and a 

 macroscopic examination will reveal the presence or absence of dust or stems, while 

 the leaves will be in condition for examination as to their form and structure'. 



2 PREPARATION OF SAMPLE.-TENTATIVE. 



Grind the sample and pass it through a sieve having circular openings 0.5 mm. 

 in diameter. 



3 MOISTURE.— TENTATIVE. 

 Proceed as directed under IX, 2. 



4 WATER EXTRACT=.-TENTATIVE. 



To 2 grams of the original sample in a 500 cc. Erlenmeyer flask add 200 cc. of hot 

 water and boil over a low flame for an hour. The flask should be closed with a rub- 

 ber stopper through which passes a glass tube 18 inches long for a condenser. The 

 loss from evaporation should be replaced from time to time by the addition of 

 hot water. Filter through a tared filter and wash the residue until the filtrate meas- 

 ures 500 cc, stirring the contents of the filter throughout the process to facilitate 

 the filtering. Dry the filter paper and residue in the funnel in the steam oven until 

 the excess of water is removed, transfer paper and contents to a tared weighing 

 bottle and dry to constant weight at 100°C. 



5 ASH.-OFFICIAL. 



Proceed as directed under VIII, 4. 



6 SOLUBLE AND INSOLUBLE ASH.— TENTATIVE. 

 Proceed as directed under IX, 17. 



7 ASH INSOLUBLE IN ACID.— TENTATIVE. 



Proceed as directed under XXIV, 5. 



8 ALKALINITY OF THE ASH.-TENTATIVE. 



Determine the alkalinitv of the soluble and insoluble ash as directed under IX, 

 18 and 19. 



9 PHOSPHORIC ACID IN THE ASH.-TENTATIVE. 



Determine phosphoric acid fPjOs) in the soluble and insoluble ash as directed 

 under XXVI, 11 and 12. 



10 PETROLEUM ETHER EXTRACT.-TENTATIVE. 

 Proceed as directed under XXVI, 19. 



