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June 21st 8° 55' a.m 1879. Gossypium herbaceum— radicles extended horizontally over water — tips well cauterised— Black dot at 9 mm from apex. To see if destroys Geotropism.

1° P.m all caustic straight

(1) caustic 4° 40' horizontal — not grown 9 m. (22d 7° 45 mm a.m after 23° Horizontal; length 15 mm

[calculations not transcribed]

(2) caustic 4° 40' near 12 mm.— quite horizontal (22d 7° 45 horizontal & described on cork 17 1/2 mm.)

(3) caustic 4° 40' 12 mm Horizontal (22d 7° 45' a.m — horizontal, 21 mm.)

(4) caustic 4°. 40 9 mm. Horizontal (ie not grown) (22 dead) ✔

(5) caustic 1° P.m. 4° 40 10 1/2 mm — slightly up down turned but straight, unlike those acted on by Geotropism (22d 7° 45' a.m— not curved but slightly inclined 12 mm)

(6) caustic 4° 40' 10 mm. Horizontal (22d 7° 45' a.m— quite horizontal 14 mm)

(7) (0) 1° little up downturned 4° 45 — apex vertically down

(8) (0) 1° little up downturned 4° 45 considerably geotropic (22d 7° 45' a.m. almost vertically down

(9) do— 4° 45 almost vertically geotropic— 22d 7° 45 a.m quite vertically down

10

over

Conclusion

21' 4° 40' P.m. It is certain that touching apex with caustic — prevents geotropism.

In radicles not touched curvature extends for about 6 mm.—

Length of blackened or only discoloured apex in the 6 touched radicles from 2/3 to 1 mm.)

(See remarks under 22d. 7° 45 —22d. 7° 45. evidence now after 23 hr far better evidence for growth great & yet 3 have remained horizontal.

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10 (0) 4° 45 slightly Geotropic— 22d 7° 45am. almost vertical

(11) (0) 4° 45' vertically geotropic — do quite vertical

(12) (0) 1° plainly down turned' 4° 45' vertically geotropic do do.