(5

Cobæa

Aug. 29th I can see no evidence of peduncle of leaf, when tip of internode tied, moving spontaneously, but tendril did so — The peduncle kept always upright.—

When kept in Hot-house, & after hooks free duration of movement of tendril, hardly more than 36°. —

It is pretty how by blowing the hooks can be made to catch an object a bush beyond extreme range of revolution.

Aug 30th after one terminal branch has caught by hooks & curled slowly round branch, movement goes on & by degrees all other branches at all near come into contact & wind round & catch each other in an inextricably hooked & twisted manner.— The main stem in 12° came corkscrew & this brought more side branches into contact.

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Cobæa

Aug 31. The main stem corkscrews & this brings the lower branches nearer & this by these slow movements they come into contact & seize stick, originally caught only by terminal branchlets.

Thus the stick at last most firmly secured & stem dragged near supporting object, or latter to former. — (Wind)

Sept 2d. I have watched another tendril catching shorter of 2 ultimate br rather large branches caught, & then other moved & caught: The first then freed itself. The main tendril slowly bowed itself from one to other side & upwards & downwards; & as if free turned the main

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branches up & down & thus appearing to rotate on its own axis, brought all the branches into contact with stick. The minutest branches slowly spread themselves out, regularly over surface of stick like roots; it was very pretty to see how each double hook at end of the convolutions had moved to come into contact with the bark: how this is effected I know not; indicates some extreme sensitivity in one side of tips.—

Then corkscrew action began near stick & thus dragged the lower main branches one after the other to the stick, & as they were turned backwards & forwards, they came into contact & adhered. There is no sympathy between such branches-lets, each must be touched to adhere.— There was no hitching forward as with Echinocystis.—

Thickening & stiffening of caught tendrils

9 (7

Cobæa Scandens Oct 29 1863

On flat surface in greenhouse hooks, with rare exceptions, become neatly attached. Whole tendril corresponds to terminal leaflet with foot-stalk. Upper surface of t- angular & green. lower surface rounded & purple. The Green stripes very narrow on branchlets run to upper surface of terminal hooks; difference of colour probably determines the movement.

No movement till tendril comes into contact. It is mere case of leaf turning to light. Hence slow adaptation of branches to surface, & removements.—

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Summary

like æstivation leaf upright & then bowed downwards

(1) (2) growth movement, divergence of branch, when mature

(2) (1) spontaneous movement — innate excitement— Heat, not light

(3) irritable movement—

(4) light movement

(5) corkscrew from excitement of a part the distal extremity

All movements from such various excitements adapted to one end, the attachment of Plants— The ascent, the gaining of advantage which a tree has, without expenditure on a trunk.—

To show how diverse the excitements causing movement— in comparison with animals—

If lower terminal branch caught

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pretty how corkscrew movement draws up all lower, moving branches.—

Nov. 3d. Clearly the green line on top of each branch turns to light i.e. all elements of leaf, though at first indifferently directed, arrange themselves upper surface to light; lower to darkness—

Movement commences before branches diverge—

Put long slip of glass [sketch] imperfectly caught, this happened in any all cases.—(dislike glass)

3 branchlet pointed from glass to black card. 1 inch at back.— Last evening changed card to foot of glass & this morning all 3 branches have moved to glass or round edge, to opposite side towards card. — This morning at 10° 45' again moved card to back.

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with 2 horizontal bits of glass again saw branches stretching to card at back.

The movements are as if whole purple surface of each branch & branchlet avoided light — it will not do that green strip searches for light — like rootlets of ivy, Knight?

Nov. 7th I have now examined several stick & flat bits of board, & certainly the end of branchlets all turn to surface beautifully.— Sometimes only one Hook catches; sometimes whole terminal branchlet division cannot get down; but this is rare case—. Hooks naturally opposed, but usually both bend into contact.

A thread of green to each hook, so 2 to each terminal branchlet. — This curious movement hardly touch for it implies repulsion.— but Colour indicates light as agent.— Hooks supply the act curling round of tip of t. in