34 
RESEARCHES ON THE MANUFACTURE 
By the warm water method. 
Dry 
matter. 
Theine. 
Tannin. 
Crude 
protein. 
N-free 
extract. 
Total 
ash. 
Potash 
ist infusion. 
8.43 
o.gi 
4.49 
0.528 
1.82 
1-59 
0-535 
2nd ,, . 
7.60 
0.74 
4.07 
0.476 
1.83 
r-33 
0-533 
3rd 
5.69 
0.75 
3-97 
0.452 
0.82 
0.45 
0.2x6 
average . 
7.24 
0.80 
CO 
H 
- 4 - 
0.486 
I.29 
1.29 
0.428 
By the boiling water 
method. 
15.34 
i-33 
7-°4 
i.061 
5.08 
2»II 
1.384 
The latter numbers are too high, since in the above trial, a 
superior tea was employed, while in practice only a medium 
sort is brewed in this way. Assuming that we drink daily 300 
c. c. of such iufusion, as prepared by the warm water method, we 
shall consume the following quantities of the active components 
of tea (in grams) : 
Dry matter. 
Theine. 
Crude 
Tannin. protein. 
N-free 
extract. 
Total. 
Potash 
2.17 
O.24 
I.25 0.15 
0-39 
o -34 
0.13 
The tea used by the middle classes is of a description far in¬ 
ferior to that above mentioned, being generally about 20-30 sen 
per kin. An analysis of such tea, made in our laboratory, gave 
the following results. 
Water.11.45 % 
In 100 parts of dry matter : 
Crude protein.26.87 
Crude fibre.10.89 
Ethereal extract.15.64 
Other nitrogen-free extract. ..22.92 
Ash.6.23 
Theine.2.03 
Tannin.17.65 
Soluble in hot water.38.89 
Total nitrogen.4.299 
Non-albuminous nitrogen.°'955 
In 100 parts of pure ash : 
Potash.36-93 
Soda.9.78 
Lime.3.24 
Magnesia.12.56 
Ferric oxide.8.g2 
Mangano-manganic oxide. ..1.01 
Phosphoric acid. I 5-72 
Sulphuric acid.7.46 
Silica.1.57 
Chlorine.2.21 
For brewing such tea, generally, a decoction method is applied. 
Assuming that we consume daily 15 grams of air dry tea, and 
that the whole of the theine and tannin is dissolved by water, 
