P. 41. _Additional note on Ulva_. M. Hubert made some observations on the air contained in the cavities of the bambou. The stems of these canes were from 40 to 50 feet in height, and 4 or 5 inches in diameter, and might contain about 30 pints of elastic air. He cut a bambou, and introduced a lighted candle into the cavity, which was extinguished immediately on its entrance. He tried this about 60 times in a cavity of the bambou, containing about two pints. He introduced mice at different times into these cavities, which seemed to be somewhat affected, but soon recovered their agility. The stem of the bambou is not hollow till it rises more than one foot from the earth; the divisions between the cavities are convex downwards. Observ. sur la Physique par M. Rozier, l. 33. p. 130. P. 65. _Additional note on Gossypium_. --------emerging Naïads cull From leathery pods the vegetable wool. ----_eam circum Milesia vellera nymphæ Carpebant, hyali saturo fucata colore_. Virg. Georg. IV. 334. P. 119. _Addition to Orchis_. The two following lines were by mistake omitted; they were to have been inserted after l. 282, p. 119. Saw on his helm, her virgin hands inwove, Bright stars of gold, and mystic knots of love; P. 136. _Addition to the note on Tropæolum_. In Sweden a very curious phenomenon has been observed on certain flowers, by M. Haggren, Lecturer in Natural History. One evening be perceived a faint flash of light repeatedly dart from a Marigold; surprized at such an uncommon appearance, he resolved to examine it with attention; and, to be assured that it was no deception of the eye, he placed a man near him, with orders to make a signal at the moment when he observed the light. They both saw it constantly at the same moment. The light was most brilliant on Marigolds, of an orange or flame colour; but scarcely visible on pale ones. The flash was frequently seen on the same flower two or three times in quick succession, but more commonly at intervals of several minutes; and when several flowers in the same place emitted their light together, it could be observed at a considerable distance. This phaenomenon was remarked in the months of July and August, at sun-set, and for half an hour after, when the atmosphere was clear; but after a rainy day, or when the air was loaded with vapours, nothing of it was seen. The following flowers emitted flashes, more or less vivid, in this order: 1. The Marigold, _(Calendula Officinalis)_. 2. Garden Nasturtion, _(Tropæolum majus)_. 3. Orange Lily, _(Lilium bulbiferum)_. 4. The Indian Pink, _(Tagetes patula et erecta)_. Sometimes it was also observed on the Sun-flowers, _(Helianthus annuus)_. But bright yellow, or flame colour, seemed in general necessary for the production of this light; for it was never seen on the flowers of any other colour.