(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 20° C

Examined at 6.35 pm. i.e after 9° 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 9° 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 30° 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 10° a.m say 9° ie aft 24° 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 45° below

25. basal 8 straight apical 17 abt 45° 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