(1

Radicle Bean. March 30th

10°.25 apex (with red point) touching on one side blackened glass → [sketches]

Sensitiveness

11° 45 → [sketch] red point I can see

1. 40' → [sketch] blackened no longer touches glass

I removed the bean & fixed it fresh at above with radicle at ∟' to glass but bowed downwards. The blackened spot which had touched glass was so small that very little pressure cd have been exerted, I am almost certain, that whole radicle was nearly straight when first put into contact, & now 1°. 40' terminal portion 1/10 or 2/10 in length, bowed at right angles, & no part touching glass— must be sensitive to touch.

I remember before bowed up from glass.—

[82v]

[in margin:] I might try rubbing suspended beans on opposite sides

March 31. 5° P.m. The bowing either lateral or vertically [sketch] which follows from apex coming into contact with resisting object, I think cannot be due to mere mechanical resistance, as tender apex is so extremely little flattened. It seems to give cause some way up & back in the radicle, a changed order of growth, so that one side i.e. the concave one grows less, or rather above all the growth confined, though still growing & this makes a bow. Perhaps it depends whether the inferior or lateral face of apex is pressed against the surface, on which side of radicle growth is lessened. If meeting obstacles at right angles or nearly so, with continued growth downwards ؟؟ the lower upper side wd be pressed & then as far as I have seen there is upward bowing. If meeting obstacle at a considerable angle, then one side is pressed & then this side grows quickest & become convex. If this view seems probable, I cd put inclined glasses. [sketches]

—If sand pressed very hard cd not penetrate. — (would 1/4 of oz cause apex to be curled.)?

How far back does Bowing extend??

(I suspect when growing in ground the extreme apex is not pressed, but perhaps opened by transverse growth, & the downward pressure prevents cone slipping upwards.)

[82b]

March 31' Sensitiveness of Radicle. Bean

(1) Metal-pot— apex turned up a little to zenith— red line straight, at rt angles to opposing glass

11° 7' an atom flattened, almost transversely

12° 45 red line much curved— apex not upturned

11 7

1°. 40'

(say curved in under 2°)

(2) red line straight, nearly at right angles to opposing glass, 10° 30' not yet touching

[sketch]

12 45 red line curved a trace. 5° P.m. bowed upwards: I think due to apex being on rough crack between horizontal & vertical glass.

(3) red line straight, nearly at rt. angle to opposing glass

10' 30' point touching squarely— added a bit of red in straight to tip. [sketch]-line transverse where old red line ceased. → [sketch]

11° 10 I see tip slides on glass with greatest ease if earth pressed behind opposing glass— 12° 45 red line slightly curved. 5°. P.m. like no. 3.

(over)

[82b]

Ap. 1'. The 3 radicles with straight painted red line on back of page had the red line greatly stretched out.— The extreme apex resist pressure surprising well, & is not crushed, I think, with root radicle pressing with force of 1 oz— Slips with greatest ease over glass; therefore I do not think that if the rectangular bending of radicle, when it meets glass plate, & which affects the radicle for a distance of from .3 to .45 from apex, can be due merely to bending of this much of the radicle, for the whole of this part is growing, it must be modified growth.

If the apex merely grew to one side because it could not grow straight on, I do not think radicle wd become bent so far from apex. The bend side on which the apex touches most seems to grow convex

[83]

[top of page excised]

move after the Carb. of Ammonia was added

March. 27-29th 23d removed the bean Smoked glass No. III. inclined at 51° above Horizon; with match at bottom at right angles to crown of bean which deflected the radicle

April 2d 10. 30' — Smoked glass with Bristle & Smoked glass with rough wood transversely to it [sketch]

(Ap. 1' smoked glass laid horizontally, with 2 radicles travelling over, but though in contact at first they both raised themselves above glass & only touched & scored the soot occasionally through circumnutation; I suppose with horizontal glass, the apex pressed down too much & then the root is deflected upwards, through the sensitiveness of its tip.??)