tea. Indian (Assam) tea and Ceylon tea, being stronger in theine,
would suffice in lesser quantity.

Theine is soluble in about 100 parts of hat water. It vaporizes
at 185 degrees C. or 365 degrees Fahr., hence it is not driven
off by continued boiling of tea infusion.

W. Dittmar found by experiment that prolonged steeping of tea
leaves up to ten minutes increased the proportion of theine in
the infusion. His results are as follows:

STEEPED 5 MINUTES.

Average of 8 samples Chinese tea:

Theine, per cent infusion--2.58 Tannin--3.06

Average of 6 samples Ceylon tea:

Theine--3.15 Tannin--5.87

Average 12 samples of Indian tea:

Theine--3.63 Tannin--6.77

STEEPED 10 MINUTES.

Theine, per cent infusion--2.79--Increase about 10 per cent
Tannin--3.78--Increase about 25 per cent