[121]

Phalaris— Caustic to tips.—

Jun 11th 8º a.m 1879. (Cloudy)

10 young seedlings with apices dried with blotting paper & then about I m.m. of apex touched 3 or 4 time with dry Caustic — 2 Pots placed before S.W. Window

Pot I. 4º 30' P.m. all 5 bent, but only minutest point blackened tips ought to be moistened for 1. m.m.— One is only little curved & this is blackened on one side for rather more than 1 m.m.

Pot II. 4º 30' nearly same result— one very tall one 2 very little seedlings hardly at all curved — some of short ones blackened almost 1 mm. pot well covered.—

4º. 40' P.m Lunar caustic for about 2 m.m. having moistened tips much; some old & some new not in Pot II & placed both pots horizontally.—

12th 7º 30' a.m— in Pot II. those which had 2 mm cauterised have straighten themselves & have very slightly curved or hardly at all curved apogeotropically, but then I do not know that they have grown—

12th 8º a.m in Pot II 5 fresh seedlings which had become much curved apogeotropically had tips for about 2 m.m moistened & well cauterised & placed before S.W window so that light acted on their slightly convex backs

(for results see over)

[121v]

12th 4º 30' P.m.

(1) curved to light, but then the blackened part consists almost wholly of the escaped young leaf protruding from apex of sheath

(2) remained curved from former apogeotropically & therefore curve opposed to light— Blackened part 5 1/2 mm— Unblackened 5 mm.

(3) Blackened 4 mm— unblackened lower part above ground 10 3/4 mm seedling straight, so apogeotropism probably acted, but not afterwards Heliotropism

(4) Blackened part 5 mm, unblackened 13 mm.— still curved slightly from former apogeotropic

(5) Blackened part 4 mm. — unblackened 11.— seedlings quite straight—

N.B Blackened part in each case shrivelled —

The sole interest of this observation depends on whether growth in lower part. —