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Virginian Creeper

July 1. 3° 30' P.m. set stick to base of upper fork — it had before moved a very little with watch.—

July 2d. 11°. 45 moved to short stick

2° 40' moved further do

4 40 moved further, altogether laterally 55°

July 3d 7° 45' has begun to retrograde

― 7° P.m. has retrograded to 1' mark.

July 25th. Again observed tip of shoot moved a little not more perhaps this wd be accounted for by light.

The tendril certainly moved a little & spontaneously

26th I put tips of tendril to stick; they showed æ

July 29th I have been observing again: shoot does no move more than can be accounted for probably growth. —

Certainly the whole tendril moves very slowly & irregularly in two directions, so as to make greater or lesser vertical angle with the shoot from which it springs & laterally.—

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9°. 38 Hooked

10°. 45 short stick

"On the irritability & spontaneous movement of the Tendrils (& internodes) of several Plants.".— by C.D.

No clasping movement. & on the 29th moved a little way from stick. An older tendril possibly showed feeblest attempt at clasping.

I see on tree the tendril show little sign of Clasping —

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Ampelopsis Virginian Creeper

The t. are much & irregularly branched, & the branches move slowly & independently, & more quickly than the whole tendril. I repeatedly found them in quite changed positions.

The torpidity of the movement of the tendril extends to its irritability; if it possesses any — it shows little or no inclination to clasp a stick — after coming into connect with a brick, the branches often moved away & came again into contact. — Here How while exposed to wind, it secure secures itself I do not understand. The tendril apparently must rest for a long time undisturbed — Sometimes A. Gray says tendrils are never enlarged at tips.—

Aug 6th. Examined tendril which had touched brick, the convex side surface & side of the slightly hooked apex, swells rapidly & becomes bright red & is covered with prominent hemispherical cells— When it p Only a lone of green & unaltered tissue can be traced along the concave side. — When it has touched the cells can be yet

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I am strongly inclined from the attachment of cushion to quite smooth painted wood, that it is secretion of some cement.— Certainly function of cushion. excited by contact with hard substance.—

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Virginian Creeper

seen, but they are less prominent & paler coloured.

The whole swelling (call it cushion) soft & gorged with fluid.

I observe spherical semi-hardened drop secreted on young internodes & leaf stalks.—

The tendrils shorten by corkscrew with medial kink.—

The branchlets which do not become affixed & perish, on an attached tendril: I have noticed this with Bryony — that attachment keeps up life — ie performing function. The withering & shortening of of branchlet in tendril formed within a month or two, became unattached is surprising because all the attached branchlets of tendril endure long, & when they die they have acquired the most extraordinary strength, elasticity & durability. — There are some now very strong, which must have been exposed for 14 or 15 year to weather on my house— One single branchlet, perhaps 10 year old, thus exposed, supported 2 lb.— It now hardly not thicker than fine twine very thick bristle—

Most beautiful adaptation: as the creeper depends on this support. There were 5 branchlets attached to the one tendril, & each probably wd have supported, when so old, 2 lb.—

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(Virginian Creeper)

Aug. 8' I see cushion envelopes projecting irregular atoms of stone, so attachment partly mechanical; but as it adheres most firmly to smooth painted wood some other cause necessary. — Acetic acid — warm water for many hours, Alcohol, Sulphuric Ether nor Chloroform no effect, on the supposed cement.—

Aug' 9th. I have been examining several cushions, certainly essential oils (I tried oil of Thyme & Peppermint mixed) has a marked effect in loosening every particle of stone, by immersion & a little warmed of some hours duration, except such as are deeply embedded & these are only mechanically held. (I tried all this repeatedly) Essential oils dissolve caoutchouc. — The difference was marked compared with anything else tried. —

Aug 10th On Brick in Greenhouse after 38° touching, end of tendril showed plain signs of swelling.

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Aug 23. Knight right tendril in under 24° travelled 180 from light.—

Aug. 16 I now find that 24° of Sulphuric Ether separates stones &c from disc

(very different in appearance from woody fibre, beneath cellular layer, on upper surface of disc: I conclude. (Aug 16th) it is greatly modified cellular tissue on back of on disc.

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Virginia C.

Aug 13' Clear case of ends of tendril on smooth board swollen considerably in 48°: in 24° more hours firmly attached to smooth board.— lie flat on sides on board; all neatly adpressed— Tendrils often leave surface capriciously.—

Aug 13th The green unattached tendrils have so but inconsiderable strength; they branches wither after a time & shrank into finest thread. The vital action from enlargement of disc leads to great ultimate increase in strength & thickness.

Aug 15 After leaving disc in Turpentine for 24° no doubt attached of bits of fluid greatly weakened compared with water & much more than spirits which has little or any effect.— The under & attached layer, which was at first cellular, became after orange tough fibrous orange matter with no distinct structure & very doubtful whether secretion on woody fibre XX

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Finish paper by generality of movements & irritability in such diverse members of the Veg. K. & then show foundation in irritability of young leaves. Hofmeister — movement to light— gradation. —

The observation on movement do not apply to very young tendril; these seem to adapt themselves flat to wall more readily — The branchlets spread out like fingers of a hand.

Aug. 16 I have now case of young discs swelling & becoming attached in 42°!!

Several days after attachment of discs, the branchlets are not strong & will break far easier than pull off discs— Strength is evidently acquired by growth. —

Tendrils must have with many lateral branches 4-5. inch in length