[19]

1874. Cassia mimosoides from Kew.— When awake the alternated compound leaves diverge from oblique branches, but are directed a little towards apex of branch— The leaflets all lies in the same plane & are diverted a little towards apex of leaf.

When asleep the leaves move towards branch, which is the same movement as of the petioles of common Cassia.

The leaflets in closing over each other like tiles, bend a little down so that the pinna footstalk lies between the 2 rows, & they midrib of common leaf twist round so that lower surface of leaf is exposed — in mimosa they move more upwards yet general appearance very like. Both sides of leaves silvery in water.

The whole leaf has a very peculiar motion, it not only approaches the branch, so that all the leaves make a loose cluster, but the whole twists round, so that the midrib of the common leaf, instead of looking up to the zenith faces the branch which bears it.—

It is a twisting movement like that of each separate leaflet of the leaf— The whole back of common leaf faces outwards—

[19v]

July 18 syringed C. mimosoides with water at 67°— main petioles a little depressed each leaflet rose a little upwards & forwards, so that they slightly closed together

[diagram]

July 18th water do. C. pubescens main petioles became considerably depressed — leaflets in a marked manner become depressed, as if to cast off rain, but I doubt whether each pair approached each other—

N. B. Leaves very pubescent