Some observations were made on the circumnutation of the leaves of L. luteus and arboreus. It will suffice to say that the leaflets of the latter exhibited a double oscillation in the course of 24 h.; for they fell from the early morning until 10.15 A.M., then rose and zigzagged greatly till 4 P.M., after which hour the great nocturnal fall commenced. By 8 A.M. on the following morning the leaflets had risen to their proper height. We have seen in the fourth chapter, that the leaves of Lupinus speciosus, which do not sleep, circumnutate to an extraordinary extent, making many ellipses in the course of the day. Cytisus (Tribe 2), Trigonella and Medicago (Tribe 3).—Only a few observations were made on these three genera. The petioles on a young plant, about a foot in height, of Cytisus fragrans rose at night, on one occasion 23° and on another 33°. The three leaflets also bend upwards, and at the same time approach each other, so that the base of the central leaflet overlaps the bases of the two lateral leaflets. They bend up so much that they press against the stem; and on looking down on one of these young plants from vertically above, the lower surfaces of the leaflets are visible; and thus their upper surfaces, in accordance with the general rule, are best protected from radiation. Whilst the leaves on these young plants were thus behaving, those on an old bush in full flower did not sleep at night. Fig. 139. Medicago marina: A, leaves during the day; B, leaves asleep at night. Trigonella Cretica resembles a Melilotus in its sleep, which will be immediately described. According to M. Royer,[9] the leaves of Medicago maculata rise up at night, and “se renversent un peu de manière à presenter obliquement au ciel leur face inférieure.” A drawing is here given (Fig. 139) of the leaves of M. marina awake and asleep; and this would almost serve for Cytisus fragrans in the same two states. [9] ‘Annales des Sc. Nat. Bot.’ (5th series), ix. 1868, p. 368.