143

 Peas Radicles 1879 8º 45' a.m 

(Big Topping Jar)

June 8th Suspended perpendicularly over water— one side of apex just touched with caustic— Peas in different positions. (9th. 8º a.m immersed all the radicles in water)

(1) 4º 25 slightly curved from mark (9th 7º 45' a.m. declined about 40º from black mark) 10th 8º. am slightly curved from mark

after 8º 30'

(2) 4º 25 no curvature hardy any mark, retouched laterally (9th 7º 45' slightly but certainly declined from mark 10th 8º a .m curved almost at right angles from mark

(3) 4º 25 mark on summit, no curvature retouched on summit (9th 7º 45 whole tip. blackened, but rather more or one side & declined slightly from this side (10th 8º a.m very doubtful curvature, rather say none.)— I may safely say slight curvature at first from mark

(4) 4º 25 curve curved from mark (9th 7º 45', decidedly but not strongly curved from mark. (10th 8º am strong curved almost at right angles from mark

(5) 4º 25 very light brown mark— slightly curled retouched (9th 7º 45 a.m. not affected) (10th 8º a.m whole end of radicle killed & distorted

(6) 4º 25' mark on summit,— no curvature, retouched (9th 7º 45' barely or not at all affected.)

10th 8º a.m. just like (5))

Half acted 4 (4/6 acted)

144

June 8th 8º 40' a.m.

1879. Jar B       

Peas radicles, extended horizontaly over water with card on lower side of apices to see whether stimulus from contact will over come geotropim.

(1) card with shell-lac

(9th 8º a.m. All these are strongly & plainly geotropic !!!)

(2) like (1)

(3) like (1)

(4) like (1)

(5) Card with gum

(6) like (5)

4º 15' P.m. no marked geotropism, except one with loose card & gum.

40 (-) 15 (=) 25

144v

June 9th 1879.

8º 25' a.m

(Cards— see other side)

Extended Horizontally

4º 25' all 6 slightly geotropic so again cards have not prevented action of geotropism— What can be cause of difference?

10th. 8º a.m all vertically geotropic!

145

July 10th 8º 5' a.m. 1879.    Peas Radicles with extended horizontally

(A) on peat & covered with Peat, 10 touched with Caustic on upper side of apex — 10 left untouched— & 10 controls..— These peas had all germinated with hilum downwards, in which case radicle protrudes in same line in which it is embedded enclosed within seed-coats. (1 Big touched above— 2 Pins touched below— opposed to Geotropism. 3 Pins Control)

10 A

Touched with Caustic above in aid of Geotropism: (July 11th 8º a.m. aft 24 hr There is no marked difference in geotropism between these & the 10 control— all the shorter radicles quite as geotropic as the controls— but there are 2 or 3 longer radicles longer than any of controls & these are never so much geotropic.— This case very important for it shows at least that touch of caustic at apex does not stop geotropism.

10 B

Touched below with Caustic opposed to Geotropism 4º 50' P.m. after 8º 45' 4 of the 10 upturned decidedly 1 slightly geotropic — the other 5 straight,— but then some of A upturned & almost all straight; & only a few of C. geotropic as far as I could judge. (July 11' 8º a.m (ie aft 24º) (1) rectangularly geotropic & in this one I cd see no black mark on apex (2) about 45º — (3) slightly / (4) with just visible trace of G. (5 & 6) straight & horizontal. (7) bowed upwards radius 10 mm.

(8) bowed upward 5 m.m. (9) bowed upwards 70 mm (10) bowed upwards 30 m.m.

This case very good confirming Frank about Beans & confirming my own case with cards affixed to lower side of apex. C

10 not touched — controls. (see under A) — 1 specim hardly geotropic, very short & unhealthy.

Used under Geotropism

146

July 10th 8º 40' a.m 1879

Peas radicles— extended horizontally over water in darkness in passage— with little square of card — cemented — shell-lac to lower side of apex opposed to Geotropism

(1) Card 8º 20' 5º P.m slightly geotropic (—rather long. R. )

Control

(2) card like (1) more geotropic (rather long R)

(3) card 5º P.m more geotropic, almost rectangularly ben geotropic (rather long R)

(4) card 5º like (2 or 3) (moderately long R)

(5) card 5º P.m decidedly turned in opposition to geotropism — rather short R 

(left hand side)

(6) Card 5º P.m Horizontal — rather short R

Controls

(7) (9) 5º P. rectangularly geotropic — not very long R

(8) (0) 5º almost rectangularly ge. short R

(9) (9) 5º very slightly geotropc short R.

(10) (0) 5 rectangularly geotropic Short R

(11) (0) 5º slightly geotropic long. R.

12 (0) 5º like (1) long. R.

[diagram]

   (over)

 

(11th 7º 40' a.m. ie after 25h There is now no difference in the 6 with card & without card— in both cases the longer radicles are only moderately geotropic— the shorter ones rectangularly geotropic. No 5 only remarkable one for this bent rather past the zenith & is becoming hooked—

July 12th 8º a.m has now almost circular or hoop-shaped— hoop large for apex is now acted on by geotropism & is bending geotropically has nearly touched the Pea itself

146v

Under geotropism— I have given excellent case of 10 radicles of Pea touched below with Caustic. & of which were bowed upwards— laid in Peat, fairest method.— Refer to this my MS. p. 764.