[47]

Shoots tied Horizontally in greenhouse (Cold water

Feb 5th 12° 45 Red cords & Black dots 5 1/2 c.t from tip, to show whether grow

Tips red — ⨀ — apart — ⨀

(2 innermost leaves now in contact touched with red.)

Feb 19th. 12.15" tips apart ⨀ —— ⨀ increase

Feb 5' 12° 45' (String)

Tips red ⨀ —— ⨀ apart

(2 innermost leaves now in contact touched with red)

9th. 12° 15 tips apart ⨀ —— ⨀ increase

Feb. 9th no apogeotropism

Carnation-Tree.

[47v]

Red

⨀ 9th length of leaf ⨀ — no sensible increase in length

String do ⨀ —— ⨀

Very little increase in length over — 5 1/2 c.n

[48]

Petunia violacea Feb. 12' 7° 50' a.m Upright in dark

same distance marked on back ⨀ ⨀ of both leaves — 14th 8° a.m not increased in length, but perhaps growth at base of leaves

Distance of 2 central young leaves apart ⨀ —— ⨀.

Feb 14th. 8° a.m —— ⨀ ——⨀ increased

Horizontal in dark — stem tied 8° a.m 12th

Larger pair— growth mark on beneath of both leaves 22 m. m same length: growth at base??

Distance of apices ⨀ ⨀

14th 8° a.m ⨀ ⨀ distance increased

Stem in great state of [Tension] bowed at right angle when freed from stick

very young pair of leaves

Distance of apices ⨀ ⨀

14th 8° a.m. ⨀ ⨀ distance increased

leaves themselves straight, but little short to which attached apogeotropic, for could

not be secured to the stick

[48v]

Some young leaves of about the same age & same [illeg], on a plant laid horizontally & one another kept upright, kept in complete darkness for 48°, diverged in the same manner & apparently were not affected by apogeotropism; though there stems were in a great state of [illeg] for when freed from the stick to which they were pinned, they bow instantly bowed upwards.

[49]

Hyponasty Mar 2d 1879

The arched Hypocotyl of cabbage in straightening certainly circumnutate & move in plainly zig-zag line

p 37 The epicotyl of the Bean V. faba in straightening itself tra sometimes travelled in a zig-zag line indicating circumnutation.

p. 84. arched secondary shoot from epicotyl of Corylus in straightening itself moved in parts in distinctly zig-zag line.

(Add nos of Fig when given)

[50]

Feb 7th 8° a.m 1879

Tied Hypocotyls in each case.

Placed Cots of Ipomœa nil, by placing pot Horizontally so that one pointed up & one vertically down by 4° Pm. one had bents its petioles downwards & one bent upwards, as if acted on by Heliotropism.— I cannot see how apogeotropism cd act on upper cot see Back

2 Plants of Gossypium herbaceum— one placed as above, & it bent its cots in same way— — The other plant was placed transversely & both its cots were bent up as by apogeotropism or by heliotropism.

Everything here seen may be accounted for by apogeotropism of petioles curving blade at right angles.—

[50v]

[sketch] Pot laid Horizontally

[51]

Feb. 9th —1879 8° a.m. to 4° P.m.

Oxalis corniculata — the nearer petioles depressed & further one

Leaf [sketch]

raised vertically— The seedling with true leaves, one bowed so that leaflet face laterally, the old Hypocotyl not being bent

Sida—Hypocotyl has got all pin & bent— but a free & older seedling the cots face light a little

Ipomœa nil— nearer one with petiole bowed down— further one

Leaf [sketch]

petiole standing vertically up— Certainly great difference in position of petioles

over

Gossypium Hortense very little difference in position of Cotyledons, but these odd I think The 2 which are transverse to light (& the youngest one) a little inclined to light—

a few observations to try whether cotyledons do really bend to light pots put into Blackened Box in Hot House — Cloudy day — received only lateral light.

[51v]

These few observations quite agree with wide experience incidentally gained whilst watching circumnutating plants young & old.— Seeing how when the 2 cots are placed in a line facing a lateral light, how the one further from the light bend up & the near one nearer to the light often bends down down— (or both when cots. transverse bend laterally—)— Seeing this is astonishing, seeing that Cots close to the ground & very feebly illuminated on lower side & much light on upper one that they do not bend up to to the sky.— It seem to us that the circumnutation must be specially modified for this purpose, so as to resist this tendency.—

[52]

Feb 10th exposed a Black box 8° am to 4° P.m in HotHouse very cloudy day Heavy Box— Hypocotyls shell-laced to Pin

Linaria speciosa— petiole of B. raised & vertical— petiole of A declined

[sketch]

O. corniculata not at all bent, but in all 3 seedlings the shell-lac has, I believe Certainly caught the petioles of cotyledons & this prevented them from curving

Gossypium Hortensis— — no effect whatever