15

Beans with long radicles placed in water with some nutrient Fluid.— May 20th 8° a m no effect

May 19th 8. 45' a.m (13) with square of sand paper & black asphalt cement May 22d no effects

do (14) do   22d no effect

 do do (15) do. 

do.  do (16) do.

16

120

I better work side of square under the bit of apex [illeg] [illeg]

(1) (In the following 12 trials bit of sand Card paper 1.8 mm. long in length by 1.5 broad or only .9 mm broad in breadth (or i.e .071 of an inch in length by .059 or .035 in breadth) were fastened with shell lac. to the apex.) Square (1) Radicle young, only 5.5 in length, sand-paper affixed behind; after 9° radicle was directed deflected in the plane of the bean 20° from the perpendicular to the side opposite to the Card, & in opposition to Sach's curvature. no curvature in the other plane at right' at right angles After 23° no change.

(Small type)

(2) Young Radicle only 4 m.m in length— Sand-paper of same size as in (1) & fixed behind in same manner. (This had better be the first one) After 9°, deflected in the plane of the bean 50° from the perpendicular to the side opposite to & from the card, & in opposition to Sachs curvature. no curvature in the plane at right angles No change after 23°.

(3) Radicle 11 mm in length; sand-paper of same size & fixed as in (1) & (2); with after 9° deflected in the plane of the bean 40° from the perpendicular, & from to the side opposite to the Card, & in opposition to Sachs curvature. The

17

Radicles Beans. 12° May 21. 12°.   Horizontal

So arranged that young radicles, placed horizontally tend through Geotropism & Sachs Curvature to bend downwards; with square of sand-paper & shell-lac beneath apex, which ought to turn them up.

(I)

(II)

May 22d. 8° a.m (ie. after 20°) all 6 radicles greatly bowed down to centre of earth, 3 of them quite vertically, the others almost so — & this after only 20°. It is certain that geotropism + Sachs Curvature quite overpowers effects of card gummed on apex— This latter a weak power.—

(III.) 5° P.m a little curved down

IV.

 (Used)

(IV.) 

See 4 Cases in pages marked X

(V.)

(VI.) 5° P.m a little curved down.

7 & 8 add 2, (but 1 only slightly geotropic)

   (truly very long radicles only should be dn

(over)

17v

May 22d 8° 20' a.m.   5 beans fastened with radicles of very moderate length horizontally & with bean itself with flattened side in horizontal plane— so that Sachs' curvature will not act upwards or downwards— fixed with shells-lac bits of card sand-paper on lower side of tips of radicles— Now if not bent at all downwards & 4° 30' will show that counteracts geotropism, by itself.—

4° 40' P.m every one of the 5 lower radicles bent towards centre of gravity ! (ie after 8° 20')

Temp of study Table 64°— At same 3 beans of same lot & age under similar conditions ha but with radicles hanging vertically were well affected by square of sand-paper of same size, fixed in same manner 

Under Beating

Consider Make note

We can see that when roots protrude horizontally, owing to position of embedded seed, it wd be very injurious for its apex to be irritated so as to turn upwards— But it is a wonderful fact that the radicle shd be position in one position & not in another.— (Use) Or it may be that sensitiveness does not exert enough to oppose geotropism; no this with vertical roots is proved false as they turn up in semicircle so as to become tip & base to lie in same horizontal plane.— There seems some analogy

9°. 10 P.m. No 11. has now point upturned as if card was acting on apex.

May 23d 8° a. m card has dropped off no 11 & now straight; but apex of no I has now turned up. little from card — others not affected: removed card & watered radicles. At 4° 40' P.m fixed new square of sand-paper with shell-lac— Bowed Radicle measured from apex to point of emergence, in straight line from 1.2 to 1.4 in length, so now much elongated. May 24th 8° a.m have not acted, but card all dropped off except one, & I suspect washed off wh soon after being put on.—

(over)