114

(163

(On the means or mechanisms by which the tentacles & the laminae of the leaves are inflected.—

I can throw very little light on this subject. The bending of the tentacles is accordingly confined to a small position near the backs; & the motive power is confined to its upper surface or that which when bent become concave. The lower surface or that which becomes convex, persists to illeg, & no doubt is the part which again straightens the tentacle during is reexpansion.

I placed an atom of meat on the gland of a tentacle & this caused it to bend in the manner here represented with the (Fig as before) which distinct position bent back & parallel to that basal position. After all movement had ceased, the tentacle attached to a narrow strip of the disk or lamina was placed under the illeg & I managed to cut off the curved surface of the incurred portion of a tentacle, illeg now immediately recommenced; & the already [words illeg] portion went on bending, until it formed

115

(164

A complete ring or circle; the straight illeg portion passing on one side of the narrow strip of the lamina. It thus appears that the convex side which had been cut off, had previously persisted to bending of the concave side taken this resistance was unused to cells forming the concave sides must have gone on contradictory; & of these cells to exterior other account being contracted [remainder of the section not transcribed]

(The question now arises, whether the cells contract by some motive power inherent in their walls, or better the contraction is from simply to this electricity which comes into play, after fluid has passed out of them in consequence of some influence transmitted to them from the gland when properly stimulated. I cannot answer the question; but certainly some appearances

115v

(a) This bending of the concave sides seen to be nearly the same action as that which occurs on both sides in many succulent stems for instance in the peduncle of a Danlcha, when split longitudinally, namely to curling inwards of the two halves.)

So that the termini or of the convex side, before it was cut away, had counterbalanced a force capable of curling the back part of the tentacle out a viz

The t of an expanded & [remainder not transcribed]

116

(165

Form the belief that the bending is connected with the passage of fluids from cells on the concave side. We have seen that during the inflection of the tentacles much fluid is secreted by the glands, & that this is [illeg words] like the fluid within the cells of the tentacles; & again during the reexpansion of the tentacles the secretion ceases.

On the other hand it is certain that the glands may secret largely, as when particles of soft sugar or of sulphate of zinc added to the secretion, without any [illeg] of the tentacle being caused. That is the purple fluid, or at least its colour which often passes from the cells on to upper or concave sides of the tentacles to the lower & convex sides; during these inflections is shown in another way. I have several times examined leaves, & found the equally dark on upper & lower sides of the tentacles, & have then placed organic or inorganic matter on the glands, or left them for several hours in distilled water or in weak solutions of salts of ammonia The tentacles have then

117

(166

[page not transcribed]

117v

[page not transcribed]

118

(167

[page not transcribed]