The quantity of potash obtainable from various plants in the manufacture of potashes on a large scale is illustrated by the following statements. 1000 lb. of the following vegetative products yield the following quantities of potashes:—
| lb. | ||
| Old spruce-wood | 1/2 | |
| Old poplar-wood | 3/4 | |
| Old oak-wood | 1-1/2 | |
| Corn-stalks | 17-1/2 | |
| Bean-stalks | 20 | |
| Grape-vine | 40 | |
| (Storer, 'Agricultural Chemistry,' vol. ii. p. 108.) | ||