580 ADDITIONAL NOTES.

and my neighbours amongft a mixture of thofe two kinds of rhu- barb, without being previoufly placed or fown there. The leaf is very large and pointed, without being palmated, and is a week or two forwarder in the fpring than either of the other rhubarbs, and the peeled ftalks are afferted by conuoïfleurs in eating to make the beft poffible of all tarts, much fuperior to thofe of the palmated or raphontic rhubarb; and are fo much more valuable as a luxury, as they precede by a month the goofeberry and early apple; and may be well propagated by dividing the roots, as they do not produce feed in all fammers. See Sect. IV. 2. 1.

3. To be infèrted at the end of Set. X. 4e 9. p.207

Mr. Ruckert planted two beans in pots of equal fize filled witn garden-mould; the one was watered almoft daily with diftilled wa- ter, and the other with water impregnated with carbonic acid gas, in the proportion of half a cubic inch to an ounce of water; and both of them were expofed to all the influence of the atmofphere except to the rain. The bean treated with the carbonic acid Water appeared above ground nine days fooner than that moiftened with diftilled wa- ter, and produced twenty-five beans; whereas the other pot pro- duced only fifteen. The fame experiment was made on ftock-july flowers, and other plants with equal fuccefs. An. Chym. 1788,

4. To be inferted at the end of Seïl. X. 7.7. p: 228:

Befdes which the vitriolic acid abounding in many clays, when: brought into contaét with mild calcareous earth, by the various ope- rations of agriculture, muft unite withit, and fet at liberty the car- bonic acid either in a fluid form, or a gafleous form beneath the foil;

4 which