Prof. Hilgard furnishes the following figures:

Name.

Moisture lost in air-drying - per cent..

Moisture remaining in air-dried material-per cent*___

Per cent, of tannin in

Dried at 100° C.

1. Black Wattle (Acacia decurrens, var. mollisima). Bark..

36.23

9.47

26.4

41.4

48.6

2. Silver Watte (Acacia decurrens, var. dealbata). Bark___

33.59

13.60

13.1

19.7

24 8

3. Golden Wattle (Acacia pycnantlia). Bark

33.67

7.43

27.6

41.6

46.8

4. European tanners' sumac (Khus coria-ria). Leaves........

10.20

16.8

18.7

5. California tall sumac (Rhus integri-

11.7

6. "Canaigre" (root of Rumex hymenose-

71.70

11.40

9.6

34.2

38 4

* Loss when dried at 100° Fahr.