OF VARIOUS KINDS OF TEA. 
35 
while 50 % of crude protein, 40 % of total ash, and 80 % of 
potasium salt can be got in the decotion, we find that the 
following quantities of these constituents are partaken of by one 
person (in grams) : 
Dry matter Theine, Tannin. Crude protein. Total ash. Potash. 
5.16 0.27 2.17 0.18 0.39 O.24 
The same quantity, namely 15 grams of air-dry coffee, which 
may be assumed to be daily partaken of by one person, 
contain according to J. König 1 the following quantities of 
soluble substances (in grams) : 
Nitrogenfree 
extractive, 
Total soluble. Caffeine. Oil. Matter. Ash. Potash. 
3.82 0,26 2.17 2.17 O.61 0.36 
Hence we may assume that on an average the quantity of 
theine daily consumed by one adult person is nearly equal, 
namely about 0.26 grams. 
i König’s Nahrungsmittel. Vol. II, p. 606. 2. edition. 
