(1

Geotropic Beans Caustic I

8.55 am Jun 23' 1879

Faba germinated in sawdust How many & employed when roots are from 3 to 5 cm in length. Each one marked at 10 mm with asphalt dot + root. Placed in fine ؟ Placed Horizontally sieved earth rather dry in a vessel perforated bottom & top; some were planted rather deep but most had only 2 cm of earth over them. Caustic with pointed bit of Ag No 3 I think I rather more than usual

Some Phaseolus multiflorus in the same way— Vessel stands on table in big room. Temp at noon 20º C

Examined at 6.35 pm. i.e after 9º 40'

Faba- caustic 16 mm, 18 mm 18, 15, 16, 20 — none of these show any geotropic bending

The non-caustic ones were harder to measure because of being bent —

No. 1 N 2 3 4

mm 10-20

sharply bent at roughly 10 mm from tip only faintly bent— marked with a pin sharp bend sharp bend at roughly 10 mm from tip

[in margin:] All not measured first day

Phaseolus. caustic marked at 10 mm. 15 mm, 19 mm. 14 mm none bent

after 9º 40' non-caustic Controls

i ii iii

14 mm. faintly bent —no mark — sharply bent 15 sharply bent.} increased to same extent

Now put back in earth except 3 Fabas 2 of which which were v well bent & the 3rd was a dwarfed (? caustic) (? non caustic) oddly bent one not recorded above.

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Geotrop. Beans Caust.

June 24. 10 am — They were taken out about 9 & put in a plate of water.

∴ we may say after 24 hr

Faba caustic.

1. 27mm bent sideways not geotropic

2 28 just perceptibly geotropic

36 basal 21 straight & apical bent say 15 below horizon.

average 37 m.m 9 caustic

no mark — no geotropism

no mark Clear geotropism at 5 mm from tip

27 — basal 14 straight, apical 13 bent at say 30 below

30 22 straight (basal); 10 8? apical crook geotropic

32 20 straight 12 crooked but in a horizontal plane with perhaps some geotropism

35 22 straight, 13 about 30º below horizon

9 caustic

Faba non caustic 4 non

31 bent geotropically throughout whole length about 30 below

26 not well geotropic

37 — 10 basal straight 27 crooked well geotropic

27 5 basal straight 22 geotropic

4 non

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Geotropic Caustic Beans I

June 24th 10º a.m say 9º ie aft 24º After the earth

Phaseolus caustic

23 mm, basal 13 mm straight apical 10 about 10 below horizon

28 straight

22 straight

Non-caustic

25—basal 6 straight, apical 19 nearly vertical.

26—basal 5 straight; apical 21 abt 45º below

25. basal 8 straight apical 17 abt 45º below} Control

[4]

Faba (caustic) Geotropism

June 29. 11 45 am caustic some abo above & some below in both cases at the extreme tip (say 21 hr) [calculations not transcribed]

June 30 — 8. 35 am

Three cauterised on the upper side are sharply bent downwards

Three on the lower side only faintly bent as shown in sketches. In No 3 the black at the tip was very faint

They were all marked at 10 mm from tip but only the marks were hidden by dirt—: in most No 3 measured 26 mm—

The Three control beans to which nothing was done are fairly bent but no as well as they ought to be

Goebel picked out 2 of the 3 upper caustics as the best geotropic of the lot, & 2 of the under caustics as the least bent [sketch]

[4v]

[calculations not transcribed]

[182]

It is clear they are not well geotropic, Sachs thinks earth dry — Goebel made sections of Faba roots; the root cap is killed up to but not all of it ؟ when it dies away is is clear uninjured; the tissue of the root is normal except close within the root cap where a row of 6-8 cells is dark orange, G says killed. He expressed it by saying punctum veg was killed

some radicle were examined by an experience physiologists