Mirabilis longiflora and jalapa (Nyctagineae).—­The first pair of leaves above the cotyledons, produced by seedlings of both these species, were considerably divergent during the day, and at night stood up vertically in close contact with one another.  The two upper leaves on an older seedling were almost horizontal by day, and at night stood up vertically, but were not in close contact, owing to the resistance offered by the central bud.

Polygonum aviculare (Polygoneae).—­Professor Batalin informs us that the young leaves rise up vertically at night.  This is likewise the case, according to Linnaeus, with several species of Amaranthus (Amaranthaceae); and we observed a sleep movement of this kind in one member of the genus.  Again, with Chenopodium album (Chenopodieae), the upper young leaves of some seedlings, about 4 inches in height, were horizontal or sub-horizontal during the day, and at 10 P.M. on March 7th were quite, or almost quite, vertical.  Other seedlings raised in the greenhouse during the winter (Jan. 28th) were observed day and night, and no difference could be perceived in the position of their leaves.  According to Bouché (’Bot.  Zeitung,’ 1874, p. 359) the leaves of Pimelia linoides and spectabilis (Thymeleae) sleep at night. [page 388]

Euphorbia jacquiniaeflora (Euphorbiaceae).—­Mr. Lynch called our attention to the fact that the young leaves of this plant sleep by depending vertically.  The third leaf from the summit (March 11th) was inclined during the day 30o beneath the horizon, and at night hung vertically down, as did some of the still younger leaves.  It rose up to its former level on the following morning.  The fourth and fifth leaves from the summit stood horizontally during the day, and sank down at night only 38o.  The sixth leaf did not sensibly alter its position.  The sinking movement is due to the downward curvature of the petiole, no part of which exhibits any structure like that of a pulvinus.  Early on the morning of June 7th a filament was fixed longitudinally to a young leaf (the third from the summit, and 2 5/8 inches in length), and its movements were traced on a vertical glass during 72 h., the plant being illuminated from above through a skylight.  Each day the leaf fell in a nearly straight line from 7 A.M. to 5 P.M., after which hour it was so much inclined downwards that the movement could no longer be traced; and during the latter part of each night, or early in the morning, the leaf rose.  It therefore circumnutated in a very simple manner, making a single large ellipse every 24 h., for the ascending and descending lines did not coincide.  On each successive morning it stood at a less height than on the previous one, and this was probably due partly to the increasing age of the leaf, and partly to the illumination being insufficient; for although the leaves are very slightly heliotropic, yet, according to Mr. Lynch’s and our own observations, their inclination during the