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Sachs. Wurzbrg Institu. Heft II. (omitted)

p. 217. roots growing in air not saturated with moisture bend towards damp-surface, because dryer side grows quicker (this seem very odd)

p. 219 He seems to think it very odd himself

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Sachs 1879. Arbeiten continued

p. 263 with Ivy long-continued light make one side of short dorsal & another ventral.

264 Carl Krause believes epinasty only effect of long-continued illumination from above, & hyponasty from geotropism & weight.—

271. Plagiotropism & Tropaeo[illeg] depends on intensity of light.

275. The anisotropy of a plant depends on inner stature & their consequent sensibility & outer causes

p 276 speaks of Hypocotyl being equally illuminated on all sides, but I shd suppose less on north — I shd think apogeotropic overshadowed the heliotropic tendency

277 cannot understand his explanation of horizontal leaves

281. cannot explain a side branch becoming vertical when leader cut away — not flow of sap.— I suspect adaptation — He thinks inner cause — Can it be a sort of reversion, as with peloric fls [flowers] & does plant really know leader cut away by increased flow of sap.

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282. Can no more account for a part, being for instance geotropic or apogeotropic than for one nerve being visual & another auditory — strong sentences comparing parts of plants to animals.

[Movement in plants, pp. 486-7: "We should bear in mind that the power of bending to the light is highly beneficial to most plants. There is therefore no improbability in this power having been specially acquired. In several respects light seems to act on plants in nearly the same manner as it does on animals by means of the nervous system.*
* Sachs has made some striking remarks to the same effect with respect to the various stimuli which excite movement in plants. See his paper 'Ueber orthotrope und plagiotrope Pflanzentheile,' 'Arb. des Bot. Inst. in Würzburg,' 1879, B. ii. p. 282."]

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Arbeiten Wurzburg 2d vol. Heft II 1879

Sachs. p. 209 Title of Paper

p. 220. radicle of Lepidium bend to damp surface through some millimeters of air

[in margin:] N. B in middle of day sun rays strike lots of right surface & in most powerful manner.

Refer to this remarkable paper as extending & confirming De Vries conclusion — under Leaves rising at night— I look at leaves like animals, as striving against a physical cause tending to bend in one direction— We now know that light does not necessary cause bending by acting directly on the part which bends.—

p. 236, 2 surfaces of Machotia very differently affected by light.

238— negative Heliotropic roots — List for Kew

239— most complex cases of combined action of Geotropism Heliotropism & Epinasty.

249 rolled up leaves are orthotropic.

251. 252} Plagiotropic or oblique organs owe their position to being dorsi-ventral— strong evidence of this

253— grows least on illuminated side — a Lichen.

254. believes that organs composed of elements, each of which is heliotropic or geotropic, opposed by my evidence of transmitted effect —