(1

April 23d 8 .30' a.m.

Maize Radicles. — Apex just touched & slightly rubbed dry with Caustic — extended horizontally  over water— Temp 70º—75º F placed on chimney Piece.

after 5h 45'm

(1) caustic Examined 2.14 pm not bent length to mark 12.5 mm

Ap 24. 8 am. Not bent. Length 22 ie aft 23º 30'

(2) caustic 2.15 pm. not bent. length 15 mm

Ap. 24. 8 am not bent length 30 mm

(3) caustic 2.16 pm not bent. length 12.5 mm

Ap 24. 8. 8 am not bent length 28 mm {but mark very faint & not very trustworthy}

(4) caustic 2.17 pm: not bent: length 13 mm. Ap 24. 8 10 am Not bent length 18 mm

(5) caustic 2.19 pm: at 8 mm from tip a bend of 15º below horizon: length 13 mm

Ap 24. 8.4 am at 30 mm from tip bent at 20º below horizon. Length 32 mm

(6) 0 bent about 35 with vertical: sharpest bend 6 mm from tip

Ap 24. 8.13 am about 15 w vertical. Sharpest bend 21 mm from tip— Length 29 mm

(7) 0 bent about 55 with vert: bend about 5 mm from tip (rather vague)

Ap 24. 8 15 am 66 w vertical. Bend 25mm from tip. Length 34 mm

(8) (0) Bent about 40 with vert: bend a too vague to measure

Ap 24 8.17 am .49 with vertical: Bend 22 mm from tip. Length 33 mm

9 (0) Not bent (Very long abt 50 mm in length)

Ap 24. 8.20 am 65º with vertical. Bend?: Length 28 mm

The lengths of the discoloured part in the 5 caustic roots is 0.56 mm [+] 0.62 [+] 0.83 [+] 0.90 [+] 0.90 [=] .381

(The last one is number 5

The cap of black is only symmetrical in one root. In one it is bigger at one side

In another at side & below In another I don't know which side was biggest. In no 5

the side towards the earth was most black. The upper side being only about 0.3 mm long.)

(over)

[203v]

April 23d. 12º 40' ie after 4h. 10', all the 4 with tips not caustic straight, all the others slightly geotropic, indeed some plainly so.—

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(2

April 28' 1879. 7º 55' a.m. Jar A

Maize, Radicles — Caustic on Tips.— on Chimney Piece. Temp. 70º—71º F

over water — in dark— All dotted at 10 mm. from apex.

Tips touched 2 or 3" with dry Caustic — Tips first dried with blotting paper.

(1) caustic 11º 50' a.m all 3 caustic. straight & horizontal (4º 40' perfectly straight & Horizontal length 12 mm — discoloured tip 1m one m.m.

(2) caustic 4º 40' perfectly straight & Hor. length 11. mm. discoloured tip 1 mm

(3) caustic 4º 40' almost perfectly straight & Hor. length 10 mm. discoloured tip 1 1/2 mm. (too much bent too much caustic on)

(4) (0) very long radicle 11º 50' just perceptibly geotropic 4.45— slightly only 10º beneath horizon!!! geotropic; length 14 mm. aft 4º hr

(5) (0) 11º 50' about 40º from vertically geotropic 4º 45' slightly geotropic 10 20º from vertical length 140 mm Chief point of curvature from apex 8 mm

(6) (0) 11º 50' almost perpendicularly geotropic 4º 45' 30º from vertical; length 17 mm. chief part of curvature from apex 9 mm. f

It is clear that caustic has much retarded growth; too much applied

(3

April 28' 1879 8º 12' a.m. (Jar E

Maize Radicles — Caustic on Tip

In all respects like Jar A of same date. Temp 70º—71º.—

(1) caustic. 11º 55 all 3 caustic horizontal & short (4º. 55' 23 below Horizon or 67º from vertically geotropic — length, 14 mm. — less than 1/2 mm discoloured— too little acted on

(2) caustic 4º 55 straight & horizontal, length 13 mm. — about 3/4 of mm discoloured

(3) caustic 4º 55 strongest & horizontal, length. 12 mm. — (2/3 of a mm. discoloured)

(4) (0) 11º. 55 about 40º from vertically geotropic (5º. P.m strongly 40º from vertical geotropic — chief curvature 10m from apex — length 15 mm.

(5) (0) 11º 55 about 45º from vertically geotropic (5º 60º 30º from vertical— chief curvature from apex— 7. mm. length 14 mm.

(6) (0) 11.55 slightly geotropic (5º. 50º from vertical— chief curvature from apex 14 mm ie whole length of R length 14 m.m. —

It is very remarkable how large a part of Radicle of this plant bends through geotropism.

(Average growth from dot to apex of the 3 with Caustic after 8º. 45' 13 mm. But as injured part less than 1 mm, & chief part of bending is 7 or 8 mm from apex— it is clear that produced effect.)

(Average growth of those without caustic During same time 14.3 mm.

[3v]

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